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Who made the 101 pump cups for Crosman?

May 30 2017 at 11:26 AM
James V.  (Login kimo57)

Mr Flectcer,
Would you have any information as to who made the 101 original pump cups for Crosman? Crosman is no help!!!
Your stock should not be made of only walnut.

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DT Fletcher
(Login DTFletcher)

Re: Who made the 101 pump cups for Crosman?

May 30 2017, 12:47 PM 

Wish I knew. I had no luck sourcing this part.

I know Ron Sauls went after this but don't know if he ever had any success.

It's been years since I've looked at this so it might be worthwhile to check in with the various airgun shops. Maybe somebody has made progress.

Anthony R
(Login fivestar45)

Might want to

May 31 2017, 10:47 AM 

check with Rick @ Precision Pellet. I know he has been having a lot of the old parts re-pro'd.

James V.
(Login kimo57)

Talk to Rick at least once or twice a week.

May 31 2017, 11:17 AM 

I got a bunch of Crosman 107's & 108's and each one has different chrony readings.
Thinking pump tubes might have to be honed out with steel wool? (like honing the cylinders on an engine when installing new piston rings)
Your stock should not be made of only walnut.

Old Ben(jamin)
(Login OldBen)

Pieces of Dead Cows

June 1 2017, 9:02 AM 

John at JG Airguns had a bunch of different diameter leather cups made up- give him a call OR
find someone on the Island who messes with leather (Any Tandy Stores still there?) and discuss the project. You can make a die from stacking washers, then form the leather cups yourself-
Barry in Tennessee

DT Fletcher
(Login DTFletcher)

101-36 EPD

June 1 2017, 9:28 AM 

Don't know who made it but here's the engineering parts drawing for the pump cup 101-36

101-36(pump cup)

DT Fletcher
(Login DTFletcher)

leather pump cups

June 1 2017, 9:55 AM 

I've been told that the Coleman lantern pump cups work for the Benjamins.


DT Fletcher
(Login DTFletcher)

Possible source

June 1 2017, 10:01 AM 

Did a search on --Pump Cup 21/32"-- and it turns out this is a common size for carburetor pumps. For example:http://www.carburetor-parts.com/Accelerator-Pump-Cup-2132-x-367_p_1078.html

Looks pretty close.

(Login cartertools)

And is it a coincedence it's a Rochester?

June 1 2017, 11:10 AM 

That's a great find! It's not entirely the same as the drawing but it seems as though the Rochester brand is a big clue...from Wikipedia "The company began as the Rochester Coil Company founded by Edward A. Halbleib in 1908,[2] becoming the North East Electric Company the following year. In 1916 the company was located at 348 Whitney Street, Rochester."
From ruralburbian Philomath.

James V.
(Login kimo57)

Will order some....

June 1 2017, 2:03 PM 

Will order some & let you know how it works out.

Thank you again
Your stock should not be made of only walnut.

DT Fletcher
(Login DTFletcher)

Re: And is it a coincedence it's a Rochester?

June 2 2017, 2:37 AM 

In addition, after leaving Crosman, Rudy Merz setup a small manufacturing business in his garage to supply precision lead balls for carburetors, so, he knew that business.

Just to add, one story I was told about this precision lead ball business is that Rudy always maintained plenty of stock for each dimension; however, on ordering a two to three week delivery was standard. If customer needed the product earlier, and they often did, there was a premium attached to the order.

Rochester is a very interesting city. It is a city of many small manufacturing businesses often located in basements and garages. These small shops thrived because of Kodak and other major manufacturing businesses in the city.

Scot Laughlin
(Login classicalgas)

Many parts in old airguns were off the shelf parts from other mechanisms

June 10 2017, 1:18 PM 

That made sense both from the manufacturers view(fewer parts to tool up for)but also for the end user. You could buy the seal washer, pump cup,or check valve seal at your local hardware store or car parts shop.

Leather pump cups of various sizes were common up until the 70's or so, I've seen nearly a dozen different sizes in dusty drawers in old hardware stores.

The Hycar pump cup in some old Benjamin rifles is probably a hydraulic master cylinder seal, as mentioned above, a carb accelerator pump seal is about the right size for a small diameter pump tube.


Terry M
(Login sotol)


June 11 2017, 4:57 PM 

I, too, have several old pumpers whose velocities are all over the place. Never thought about honing the pump tube. Have you tried it? Anyone?

DT Fletcher
(Login DTFletcher)

Here's another 21/32" pump cup

June 13 2017, 11:00 AM 

Here's another variation of a 21/32" pump cup that might work. I recall some airgun pumps using a pump cup like this but can't recall the model


DT Fletcher
(Login DTFletcher)

Re: Interesting...

June 13 2017, 11:03 AM 

Can't recall anyone describing having done this but it makes sense that a rough pump tube interior is going have an effect.

Note this comment about carburetor pump tubes:

Today's fuels with ethanol have less lubrication and demand super smooth pump bore surfaces. Polish pump bore with crocus cloth as required. Rough pump bore surfaces will cause pump cup to stick to bore and tear or dislodge from plunger assembly.https://quadrajetparts.com/accelerator-pump-cup-2332-ethanol-resistantfluoroelastomer-p-1587.html

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