When it comes down to it there is nothing better than manual tools for your Lock pick Set, whether they be retail, homebrew, macgyver style. DIY'ers look here.
I said no to the question because it was asking about picks, but I do think that the tension wrenches are something that need to be seriously considered.
Remember: Anything can be made "Foolproof", but nothing can be made "Damnfool Proof".
if i post it here, it STAYS here unless you have explicit permission from myself or the admins of this site.
Feeler gauge and others work great, but hacksaw blades are more accassable IMO and cheeper. I just picked up some for 10 for a $1. Also feeler gauges are smaller, some might not like that. But they do work great.