They are self clinching nuts (P.E.M. brand name). They are
pretty easy to install in the SB-220 to take care of the
stripped sheet metal screw problem. I have installed them
in several 220's. Available from McMaster Carr and other
places.
Bob W6VY
--- Pete Smith <n4zr@contesting.com> wrote:
> My SB-220 has a lot of American-style coarse metal tapping screws to
> hold
> on the top cover, but it also has some special little press-in
> fixtures
> under the front edge of the chassis - I believe these are actually
> some
> sort of fixed nut, but don't know what the nomenclature is. Anyway,
> another option.
>
> 73, Pete N4ZR
>
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