What else do I need to run a short back cap?

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I just picked up a short back cap for my WeldTec WP20 torch and I can't get it to hold my tungsten in.  I tried adjusting the length but it won't hold onto it like the mid-length cap the torch came with.  Only thing I changed was the cap.  Do I need to change the collet or collet body as well?
Reply:Collet and body aren't changed. They only thing I can think of; just before tightening, the tungsten should still be able to push-in 'a little' more (as in 'not too long').If you have the right short cap, they should look the same. Like this: Attached ImagesLast edited by Craig in Denver; 09-04-2008 at 01:14 AM.9-11-2001......We Will Never ForgetRetired desk jockey. Hobby weldor with a little training. Craftsman O/A---Flat, Vert, Ovhd, Horz. Miller Syncrowave 250
Reply:That's exactly like the one I've got Craig.  I'll have to try pushing it in a little more.  I did notice there isn't a whole lot of room to grind the tungsten down once it's cut to length for the short cap!