I am in the process of building up a mid 70's Holdsworth. I have some Record brakes from the period but they have the recessed type allen nut and his will not work on the frame. The brakes are in good condition, I wondered if anyone has a set with the exterior nut and shim set up that they would care to trade. Please contact me off list and thanks for your time. Rob Williams, Snow sleet and sun in Seattle.