Sheridan Valve tubing question.

[DieManInTheRough]

I am endeavoring to build a "Spyder" Pump based brass tubed marker.

Have dug through and found info on barrel material, feed tube material, and shrouding material to freak equip said marker, what I haven't been able to reliably find is 11/16/.686 tubing for the valve body portion.

Will I need to find a Sheridan body and salvage the lower tube?
Or should I use the .692 ID tube posted by Jordan elsewhere for the valve body and thicker orings on the valve?

Recommendations on the rivsert/threadsert style to use?

This will be a huge learning experience and something I've wanted to do since I first saw the craftsmanship featured on this site over a decade ago.
I appreciate any helpful tips or pointers and thanks for reading.

[Jordan]

Stock Sheridan barrel tube is what I used. It's the correct ID for 11/16" Cocker valves and other internals.

I don't understand the point of Spyder internals if you're going pump, personally... All Cocker hammers are 11/16" diameter so there's zero advantage to using Spyder bits unless you're trying to use up a broken blowback.

You can use the ATTKTX upgrade, with a bit of modification, as a mounting point for both the front grip screw and a pump kit. They slide right into an 11/16" tube. The next thing I build will use those parts.

https://www.attktx.com/products/gold-chamber?srsltid=AfmBOoq0zDkGvB_IjvgCM1-WVsE9QeP4alWUa35KfyeLZugCYfIokCLG

[DieManInTheRough]

Precisely in the spirit of I have many broken piles of crap, I can assemble one "working" pile of poo,and along the way learn some knowledge from older hands. Looks like I will be in the market for some brass shortly. I very much appreciate the input.

[JeeperCreeper]

I do. Pm me. I'll send you an old barrel

[Jordan]

Just be careful... I don't know the working pressure of Sheridan barrel tube and stay below 400psi as a precaution. I wouldn't advise anything higher unless you're confident in your ability to calculate that sort of thing.

[DieManInTheRough]

My plan is to have it regulated before the brass body via LPR, and only feed 2-300 to the body, I have read that some have gotten LP spyders down to the low 200 operating range and I won't be needing any blowback gas in this situation.