grovenor-2685 wrote:I am rather puzzled by John's jig as I don't see anything to hold the axle in place while setting it, Alan's original has 3 plates with 90 degree corners, the inner two used to hold the axle in a defined position. As i see it the two inner plates must have the 90 degree corners, although they would not need to be full height, just enough to hold the axle in place while the outer one has to allow for the maximum crank throw.
Thanks for the comment Keith, I wasn't aware that the other two upstands were needed, not having ever used a quartering tool. I can easily rivet a couple of bits of copper in place to provide the required guides.
I can also modify the way the plates are fixed together so the spacing between two of them on one side is variable.