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Tony Hwang

wrote:
Above all - a project like this should be done in a cookie
sheet or plastic tray with a tall rim. That way all parts stay
within hands reach.

Cheap frames have fully threaded screws(from head
to tip) that will work loose over a short time. Better
frames have screws that are threaded only half-way
or so(NO thread facing the surface of the hole through
the arm). Even better ones use a nut flush-mounted
on bottom side of lens frame.

There are box of various size screws and screw driver in a small
plastic case with compartment for a few dollars on eBay always.
Handy to have one around.