On Sat, 08 May 2010 17:16:22 -0500, Ignoramus9556 wrote:

The trigger guard on this kids' Savage Arms shotgun attaches with screws
(which are missing). The thread looks like 10-32, but becomes hard to
turn after appx. 3 turns. Is that possibly a weird thread, or is it just
designed to hold the screw tightly?

It probably is the standard coarse metric size 5mm x .8mm.
Note that 10-32 major diameter is 0.1900" or 4.8260 mm
and spacing is 1/32" = .03125" = .79375 mm, fairly close
to 5x.8mm metric.


[snip rest]

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jiw