As a follow-up, check out this site: They have one that has an 11.0 mm insert, which is just a smidge smaller=20 than 7/16. I just can't discern from their picture if the insert is=20 actually closed end. Anyway, things like that. Bill smplx wrote: >On Sun, 25 Oct 2015, David VanHorn wrote: > > =20 > >>I need some help sourcing the metal fitting in the picture: >>http://ecx.images-amazon.com/images/I/310e-2lm8RL._SY355_.jpg >> >>It's 7/16 OD, thin wall brass. It matches K+S stock tubing except that t= he >>end is rounded off and closed. >>http://www.hobbylinc.com/htm/k+s/k+s8137.htm >> >>The diameter is critical, the fitting it goes in doesn't flex much. >> >>I am not too picky on length, more than half is good, more than an inch i= s >>a problem. >> >>A hole in the closed end is actually good, but not critical. >> >>Why: >> >>I have an antique "Violet Ray" device that I would like to make some ends >>for. It's a rare one, which runs from 32V "farm current". Such devices >>were made by the truckload around the turn of the century, to cure whatev= er >>ailed you, but the vast majority are 110 or 220V for europe. The farm >>current device is unique. >> >>I could just go buy something like in the pic, but I want to make somethi= ng >>more like a geissler tube, which is a bit of a project. To that end, I'v= e >>taken up glassblowing, found a source of uranium glass, built a vacuum >>manifold and "filling station" and learned to seal off these tubes when >>under vacuum of 1-10 torr. >> =20 >> > >If you've gone to the trouble of taking up glassblowing why not take the=20 >final (tiny) step and make your own ends? You say the "k+s8137" matches=20 >except for the closed end. Simply get some brass sheet and hard solder it= =20 >to the end or the brass tube with a small gas torch. This is not the usual= =20 >low melting point solder used in electronics. Look up hard soldering=20 >(melts at about 600+ deg C). This will give you a square end that you can= =20 >easily round off using a buffing wheel. Depending on the radius of the=20 >curve that you want, just increase the thickness of the brass plate (or=20 >build up thickness using multiple plates). I've used this technique to=20 >make rounded end caps out of sterling silver sheet (no pre-made tube just= =20 >rolled up sheet) so I can safely say that it does produce good rounded=20 >ends. > >Regards >Sergio Masci > =20 > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .