cheaper vacuum tubes

[DeepDish]

HA HA, I am a big bargain hunter too.

I'm not sure what your stats are. For what it is worth, I posted a sizing chart from thundersplace in another thread that would work with the way the Jim Diamond's are built (thin-wall):

http://www.lpsg.org/196297-vacu-tech-help-2.html#post2919740

 

[Rikter8]

Lexan tubing is available in many diameters. You can purchase ends and epoxy them on yourself and buy the connectors to match. A harbor freight brake bleeder pump with gauge will run you around $15-20
There are "Cock cushions" out there that you can use on the end of the cylinder.