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I wonder if the 13mm (?) AF bolt heads are slightly pushing the chrome ring off centre, perhaps a reduced outer diameter washer underneath would allow enough play to allow better centreing?
Personally, I wouldn't have used A2 stainless steel for the disc retaining bolts Ted ... from memory they have 30% less tensile strength than 8.8 steel. plus the head size is likely 13mm, which isn't correct
What length are the bolts Ted?
Shame, the 500 ones are 100mm. I have some of those. I'll see what I can find Ted, might have something suitable.