General Homemade Welding clamp deep - Improvised

HM: In need of clamping floor plates and sections in places where a simple Mole-grip type clamp could never access, I found a large Valve Compressor Tool, bored a block to match the pressure cup, and found it became a very functional and useful tool...

Here it is being used to clamp a floor plate to the rear cross-member, a 10" deep reach...