It seems that when we have a job that involves disassembly, the biggest part of the job is cleaning the heads on SHCSs especially if they are countersunk. They get filled with a mixture of oil, sawdust and corn starch. (you could use this material to build bomb shelters) So. I have made little digging tools from spring wire. BTW, the wire stays used to hold fiberglass insulation in between joists makes great little hardenable tools. I'm wondering if there is a material that we could pre-fill these cavities that would be easier to remove.
The other problem I run into is that some machine parts have to come apart often and on small screws like 10-24s in cast iron, a ham-fister can easily blow-out the threads in the iron. One way of limiting the torque that the operator can apply to the fasteners is I have cut hex keys down. Is there a better way?