Good point- but not one Im able to test. Assume the in the original fixing reinforcing plate at the base of the rail engaged with the spigot nut and the 35mm set screw pulled it down tight onto it. Its interesting because the rail is only 1mm steel and of the 29mm available screw thread only about 20mm can engage with the spigot fixing nut! Have you ever been able to measure the spigot nut? I seem to remember some pictures of the seat completely removed revealing them and I thought it was on one of your threads? Chris S.
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