I don't know about you, but I often find myself test-fitting track to find its exact position on the layout. Space is always tight and fractions of an inch, particularly on curves, matter. Knowing the exact position of a large curve can help you decide on the diameter of the curve or if a straight piece must be inserted somewhere to have it come out right.
With GarGraves or Ross track, I don't want to use pins to put the sections together because I'll have to pull them apart to insert GarGraves pigtails for feeder pairs. That widens the holes for track that I wish (eventually) to permanently install. I hit upon a way to test fit these sections without using pins. It involves these low-pressure clamps called Redi-Shade. They have dozens of other uses (like structure building), too.
I found these clips on Ebay.
NOTE: ebay link deleted per TOS.
Hope this helps someone out.
George
