Technics linear trackers like SL-7

Also  I picked up a second? hand Oyaide BR12 to try on my SL-DL1. It is 2mm thicker so the SRA would be about 1 degree shallower at the start of an LP then reducing as the BR12 is concave or dished. You need a clamp for this but there is limited space due to the low profile lid height and the edge of the dustcover overlaps the record label so a smaller than normal weight or clamp is needed. I dismantled the (spare) Michell clamp that came with my GyroDec and fitted a disk of 5mm acrylic. I used a hole saw to give me a 90mm diameter disk, countersunk it for the clamp to engage on the short spindle and superglued an M8 washer on top to centre the mechanism. It does the job on the BR12 mat and the stock mat, but I have yet to listen to records on it. If I like it I will probably but small holes in BR12 so the disk-size LED's can shrine through to the sensors in the lid. I will find a neat way to cut the holes or slots, assuming first that I like the sound compared the original mat.