Progress Thread Block transplant (and more)

Lol... Hate that. Dropping the bolt or nut and then repeating "please fall through... please fall through..." I love tubular k-member and A-arms in 2 of my cars. The stock stuff catches them way too often. Anyways, your bolt is probably along the rail/edge of the k-member below where you dropped it. Run a magnet along it from below.
 
The coolant drain plugs in my stock block were useless. They were 1/4” Allen key and the Allen key rotated and stripped without budging the plug. I’m thinking about using some kind of petcock drain for coolant plugs on the new block. Do any of you use anything like that or do you have a recommendation?