Again all I can say is look at these links. The first one shows a 34 break down.The second is JM's site if you want to order seals or lube.The third shows trigger work. With the pre-load on the 350 I wouldn't open it without some kind of spring compressor or see below.
Maintenance August 27 2008, 8:46 AM
I don't have a 350 but Diana break barrels and triggers are similar .Check these sites.
http://web.mac.com/photomark/iWeb/Airgun%20Adventures/Diana%20RWS%2034%20Spring%20Upgrade.html
http://www.airguns.citymax.com/page/page/251327.htm
http://www.network54.com/Forum/184474/thread/1205093675/last-1205382466/350+Magnum+trigger+pull
I don't know how much pre-load is on but you can build a spring compressor or:
break barrel (do not cock) to remove pressure from piston/cocking arm and remove barrel
use a bar/pipe clamp to compress/decompress
Be careful removing piston so it doesn't get nicked on cocking slot.
Remove any burrs use a dowel wrapped in some fine grit sandpaper (300-400)and a drill put a screw in the end of the dowel to chuck it in the drill.
Polish spring ends smooth and any other metal to metal contact.
(You can get moly and tar from JM. I don't know how much shipping to Hawaii is but you should get a seal just in case yours is shot or just to put a better one in. You could also order some buttons at the same time and install them while you have it apart.)
Degrease every thing. I use non-chlorinated break cleaner. Stick tube in transfer port and blow everything out the back end.
Lightly moly metal to metal surfaces. Use a silicone grease on seal.
Reassemble and enjoy.
You can get some moly lube (60%) from a HONDA motorcycle shop pn 08734-0001
try open gear lube in place of tar(sparingly)
You can also install hardened washers on each end of spring to relieve spring torque.
Happy Canuck
Happy Canuck