Crosman medalist query

[shabee]

Hello Mick.
Personally I would buy the original crosman (or any other) part if it was available , purely from the originality point of view, I like originality, I like things to be nice, ive even been known to iron all the corners of gun brochures pages and cataloges because I don't like turned up and creased corners in books, sad I know.
Failing that I would try to replicate the original before trying your method but im in no doubt the majority of folk would do it your way.
I confess im a huge fan of American airguns, I have one or two myself , that said im under no misconception about the quality and strength and general standard of some of the steel pressings and the poor way some things fit together, as an example the standard slide and twist breech cover on the crosman pistol, its sloppy! BUT I like them generally. There are worlds apart in the quality of lets say the Sheridan sporter or supergrade and some of the poorer made guns.
Im sure mel will either buy one or get one made up and hell be happy.
Rgds
Eric

[mel h]

Thinking about it, I would strongly suggest sourcing the original part from the US, rather than try a DIY job. This part is just not that rare. There is no way for you to produce this part to the same standards and specs of the original Crosman part, so, for a lot of work you would be putting second-rate parts into the gun. Bit dodgy, if you were to ask me.

Thanks for the input but I can assure you that whilst the production of some of the parts inside of a pneumatic pistol may require specialist machinery, the manufacture of a couple of oddball screws is a fairly simple matter to any competent lathe user. I would respectfully recommend that you look at some of the work that has been turned out by members of this forum before using terms like second rate and dodgy.
Regards, Mel.

[harry mac]

Mel, if you do order/make a coupleof the rear sight screws, would you consider selling me one? I've had my 1300 since Christmas 1977 and it's just had a new lease of life thanks to Lawrie Amatruda, unfortunately the rear sight is held on by a mis-matched screw.

[DT Fletcher]

Thanks for the input but I can assure you that whilst the production of some of the parts inside of a pneumatic pistol may require specialist machinery, the manufacture of a couple of oddball screws is a fairly simple matter to any competent lathe user. I would respectfully recommend that you look at some of the work that has been turned out by members of this forum before using terms like second rate and dodgy.
Regards, Mel.

You don't have the original engineering/mechanical specifications for this part. Maybe a DIY part will be spot on, maybe not. That is what constitutes "second rate." You are confusing craftsmanship with engineering. They're two entirely different things.

[mel h]

You don't have the original engineering/mechanical specifications for this part. Maybe a DIY part will be spot on, maybe not. That is what constitutes "second rate." You are confusing craftsmanship with engineering. They're two entirely different things.

I served a seven year engineering apprenticeship in the nineteen sixties where I learned a little bit about craftsmanship. I worked in toolrooms and development shops for a further ten years before moving on to other things. I have a well equipped workshop, together with the original item in my possession, I really do not need the original specifications to replicate a screw.
Regards Mel.

[mel h]

Harry Mac. I've sent a PM.
Mel.

[harvey_s]

JGAirguns in the states are very helpful.
First quote always come's back with eye-watering postage charges because they are tracked and insured.
But when I've emailed John the owner to ask if he was willing to post low-value items untracked and at my risk - he's always come back witha very reasonable postage rate and to date I've had nothing go missing.

[shabee]

Following on from the previous conversation, I had a crosman 1300 that needed a bit of attention, so, I thought , kill two birds with one stone as the saying goes.
In no time at all it was stripped on the bench, all cleaned up with no apparent damage, all seals looked serviceable, so I checked the sum of the parts ready to reassemble, lubed the bits I thought needed it and put it all back.
Anyway the point is, in answer to the original question: The large screw that holds the breech block and pump cylinder together is threaded No.10 UNF and the small screw which holds the sight to the breech block via the large screw is threaded No.4 UNF if anyone is making one Mel.
Rgds
eric

[mel h]

Thanks for the confirmation Eric, I'm sorted with the threads for the larger screw ( think mine is OK anyway ) but am having difficulty finding a No. 4 die to make the smaller one, I'll have to bother a few more model making mates or simply buy one. I'm sure that I had a set some years since but these things tend to go walk about.
Mel.