I had mine down somewhere in Planet Bristol years ago, Crazy Chris might know where it is/was. It might be cheaper to get a new one done at Sussex Autos, Hailsham.
We also had our glide converter rebuilt by Sussex Autos, they did it in a couple of hours over lunch. Cut it it open and inspected it, checked the bearings, measured the fins etc to estimate trque capacity and stall speed, welded it back together and painted it! Dean.