I gave up on PSI kits a year or so ago. I had a bunch of kits come in with all kinds of plating problems. Matter of fact I just sold off all the old PSI kits I had left and all the bushings.
I only deal with CS now.
Berea has 2 click button kits that I have been using for quite some time. I have sold a good number of pens from these kits and use a pen made from their Cushion Grip kit on a daily basis with no problems.Both kits can be obtained from BB.[][]