I Am Not Sure Why I Did Not Think of This Before

I needed a 3.5" long fully threaded 1/4"-20 screw, socket head.  The best that I could find was 3" long, or not fully threaded.  I still need about 1/4" or 1/2" more length for the diagonal holder for the tinyscope rebuild.  But I can buy screw couplers that are 7/8" long.  I can thus switch to the more available 1.5" fully threaded screws with a 1" screw at the far end of the coupler,