Hi there
Terry is completely correct with his explanation, in addition to this explanation is that after some testing with loosening the domed nut against the coned washers to get more slip (like todays slippers) it would undo itself!!!!!!!!!!!!!! therefore we changed the design a little to include a tapped hole in the domed nut to allow us to put a grub screw down it to lock it against the layshaft allowing it to slip alot more without the nut coming loose. Problem sorted.
Can't beat an M3 nyloc nut though like nowadys!!
Mark
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