When I bought my silver KV6, my son had bought a new pipe with the bleed valve in because I presume the thread had gone on the plastic screw. I have used a normal bolt the same thread, and cut the threaded part of the bolt with a slot from the end of the thread, to around a third of its length up towards the head of the bolt. It fits just right into the female part of the bleeder hole. If I ever have to use it I will only have to undo it a small amount to bleed the system. A bit like the proper bleed screw, but cost nothing.
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Great Barr, Birmingham.
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