I have this ‘Third hand’ http://www.thinkgeek.com/gadgets/tools/a4bb/ I never use the magnifying glass but would love to have a PCB vise. So I made this adaptation. It’s not the sturdiest of vises due to the Third hand base, but good enough for my work. I might make a full vise later on.All the holes are under sized for drill up to correct size. The guides used is from an old spot light rail, but any tubing 6-8mm could be used (just drill the holes accordingly). The position is locked by two M6 hex bolts (15mm or cut to size) and you need to tap hole (drill up to 5mm and tap with M6).