I personally have lost screws, I do not cry I replace
them with the closest
I can find.
Me too. Ditto if I get a machine with screws missing. I find screws with
the right thread and put them in. Better that than having some part not
properly fixed.
If the tool needed was too expensive or I couldn't find it I would replace
the screws.
Well, I might have a go at making the tool (or modifying one, e.g.
drilling a hold in a Torx or Allen hex tool to fit a tamperproof screw if
the right tool wasn't available).
-tony