You coutd also make some small gains - lose a washer from behind the bolt head, lose a single spacer washer, add a spacer washer to small space to push the spring inward, move the u bolt clamp a mm outwards = you've them gained almost another 5mm.

if I remember from mine, I've not got huge amount of space. You can just make it out on the photo - and I think the armstrong damper plater is thinner than the rutherford plate.

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Last edited by TBM; 08/11/20 08:27 AM.
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10