I stuck it here because it goes with a sewing machine. The tape holder that I finally ended up with. The clamp is part of a precise terminating jig for electronic connectors, which is no longer of any use. The mounting piece had to be machined (fortunately it is brass), drilled and tapped for the threaded rod and clips on the clamp so I can easily remove it when covering up the machine. The wood piece houses a bearing, secured by the aluminium plate on the bottom. The top piece is Xenolite, left over from our bathroom reno. It is a type of perspex, with a coloured coating on one side and is pretty hard material. Based on RockAussie's reply to an earlier post I made it 200 mm diameter, but the tape I received is 230 mm (!) so I had to make an additional piece to fit on top of the disk, this is a bit of thin plastic stiffening recovered from something I scrapped.
Looks like it should work ok.