If you're a chronic gas block assembler, you know that putting the gas tube pin into the hole is a moderate PITA. One day not too long ago I was pissed off and I decided to just model up and 3D print my own tray to hold my gas blocks in place while I pin the gas tube into the block and VOILA! Quick details here:
-For my ..625 gas block but the barrel cut is for up to a .750
-Has a hole under the gas tube pin so both assembly and disassembly of a gas block can be done.
-Reversible so you can drive pins from either side of the block.