I like socket head screws and wish I had some back in the early '60's for the red head Testors .19. I was using the early shiny case version that blew fiber head gaskets at least once a week. Today I'd cut an aluminum gasket and lock it down with socket heads.
FYI, the later dull-case Testors-McCoy with lightning bolt was a much stronger engine.
.19 engines were fun.