The screws are course threaded for unthreaded holes, the screws form the threads when tightened into the holes, and bite into the plastic of the housing. 6-32 screws will work as well IIRC. Optionally, use an 8-32 tap and cut 8-32 threads into the plastic holes, and use 8-32 X 1/2" long SS socket head cap screws. For a gasket, get a sheet of 1/8" thick rubber stock, and trace out the ballast outline and use a straight edge to draw the inside lines, then carefully cut out a pair of gaskets using a x-acto knife or similar. Guide the cuts using a straight edge with the cutting blade tight to the straight edge aligned on the traced outlines. For the screw holes, cut out small "v" or 1/2 circle U notches in the outside edges of the gasket placed to clear the screw holes.
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