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Tips for BSA Airsporter end plug?

September 9 2017 at 9:17 AM
Jim in PGH  (Login 144man)
YF12

I can't get it to budge, and I'm deathly afraid of snapping the alloy casting. It's soaking in PB Blaster right now.
I think we're all Bozos on this bus.

 
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JW652
(Login JW652)
YC

BSA

September 9 2017, 1:50 PM 

If it is the same as most models, it is held in place by a cross bolt. You must use a spring compressor to squeeze the cap inward a tad before knocking out the pin. Make sure the compressor is holding everything back or parts will fly at extreme velocity.

 
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Jim in PGH
(Login 144man)
YF12

Not the same

September 9 2017, 4:19 PM 

I know what you're talking about. I have a BSA Meteor that works as you describe. The Mercury and Airsporter have a threaded alloy casting that comprises the end plug and trigger block. It's a beautiful thing, but somewhat vexing when trying to use a spring compressor.

Turns out I was able to break it free using a 36" x 1/2" steel bar inserted in the 1/2" hole in the casting. These guns are quite the challenge.
I think we're all Bozos on this bus.

 
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RBest
(Login RBest)
AR&P

putting it back together is even more fun.

September 10 2017, 11:43 AM 

What I wound up doing for these is making a wooden 2 piece clamshell block, with the insides carved out to fit the trigger assy/endblock. When bolted together, you have a nice squared up piece to work with.

 
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Steve D
(Login sd5782)
YC

Funny you should mention it

September 9 2017, 9:03 PM 

Hello Jim. I think I sold you a Haenel 300 in Findlay a couple of years ago. I have a Mercury S that I was just shooting this evening. I half destroyed the receiver and piston on mine by shooting it while it was internally grinding itself.

It was a royal pain to get apart until I finally got a bit violent with it. It was 5-10 years ago maybe. I tried with the rod in the trigger block if I remember, but no luck. I let it set for days trying to figure out a new approach. I believe in the end, I clamped the trigger block in a big vice, with wood to keep from marring. I think then I got a large box point wrench that was a good fit in the breech jaws such as one would do to unscrew an HW end block. Then some VERY sharp blows on the wrench with a big hammer.

Remember, at this point, I was going to get the damn thing off one way or another so this is a caution. It worked for me, and came off. Nothing broke and my trigger block has no marks.

Now that is only half the fun. You will never get it back together with a stout spring. I tried to make a jig to hold the trigger block while screwing it in, but that worked poorly. I did get a factory spring cut a couple coils in. Final tune used a JM .120" 4600 spring for milder shooting. It is a short stroke gun anyhow, and is plenty harsh with much spring.

All in all an unpleasant experience. The guns are indeed beautiful but….. I will say, that I am not a fan of British guns. Hope to not step on toes, but I have in my limited experience found poor workmanship and difficulty of servicing. GOOD LUCK!!

 
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Jim in PGH
(Login 144man)
YF12

Very funny indeed!

September 9 2017, 9:30 PM 

I think the aforementioned Haenel 303 was part of the trade in which I acquired the Airsporter at Findlay this spring. I was ultimately able to get it apart, with the help of a 1/2" x 36" steel rod I got at Home Depot. A new piston head, oring, and buffer, and a Maccari .120 wire 32 coil spring, and all is well. I took the time to pre-set the spring to coil bind on a piece of all-thread, otherwise I never would have gotten it back together. A lot of work for 620 fps, but overall worth it. The Airsporter is a stunningly beautiful concealed underlever taploader. Certainly not user friendly as far as servicing, but a very unique rifle.

I did make sure to coat the threads of the end plug with anti-seize before reassembly, in case I ever have to go in again.
I think we're all Bozos on this bus.

 
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Bsagunner
(Login bsagunner)
YF

I have the same problem

September 9 2017, 10:30 PM 

Hi Jim,
I have a beautiful Airsporter RB2 soaking in penetrating oil for some months now. I would really like some advice on getting off that end plug. Is there some way to releave the spring pressure before turning that end plug? I am afraid to apply heavy turning pressure for fear of snapping something.
Thanks

 
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Jim in PGH
(Login 144man)
YF12

1/2" steel rod worked for me

September 10 2017, 8:22 AM 

I put the receiver in a vice, wrapped in heavy leather. The 1/2" round bar is a perfect fit in the hole in the trigger block.

I figured it this way: The gun wasn't any use as it was, so I really didn't have anything to lose, so I just reefed on it. It's not so much spring pressure you are fighting, but corrosion caused by years of dissimilar metals being in direct contact.
I think we're all Bozos on this bus.

 
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RBest
(Login RBest)
AR&P

no way of relieving that pressure

September 10 2017, 11:49 AM 

its the nature of the beast. These are not user friendly guns to service, and some 'smiths won't even deal with them. One needs to be creative and not in a rush. See my solution in this thread.

 
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Steve D
(Login sd5782)
YC

Tuning

September 10 2017, 9:04 AM 

Jim, it sounds as though you used the same JM spring as I did. I like that spring in other guns also. The Mercury without the lost volume of the tap does 650 with Superdomes. Not much power, and certainly not like others I have read about. I also had a Vulcan that made little power also, even when worked over. I have a hard time believing all the 12fpe stories on these guns.

Also with the short stroke, 10+ must be quite harsh. I didn't even like the light shooting shot cycle with the O ring piston head. I took mine off and crudely made an adapter to hold a Diana type seal. Now the Mercury is still not powerful, but at least the shot cycle doesn't finish with a faint metallic "tink" sound from the piston head.

I did see that Airsporter on the table at the Findlay show, but after my experience I just let it find another good home. I picked up a NIB old stock walnut Diana 38 at that show that I have posted about on here or the Diana forum, so I didn't come home empty handed.

 
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RBest
(Login RBest)
AR&P

some of these brit springers ( sub 12 fpe)

September 10 2017, 11:54 AM 

need their transfer ports opened up, especially if the port was under 3mm diameter and the gun was oversprung with .128" diameter wire. JM's old Paladin spring was a bit less stiff, yet yielded performance gains in these guns.

 
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