We are indebted to Mr James Batchelor for this design. The lower arm of of your UPT accepts a jig to hold the clock plate. After centring the appropriate hole in the clock plate, your Bergeon-type reamer, guided in the upper arm, corrects the worn hole. The reamer is then exchanged for a small press which pushes the bush accurately into position.
The kit includes materials for jig, press, reamer holder etc., along with drawings and construction notes. You will already need to have built the UPT.