I assume you have a rally design Group 4 Forged coupling on there? The bolt hole is in the wrong place on them it seems. I opened the hole up a touch and then welded M8 washers on the sides so that the bolt would be in the spline grove when installed.
I also squeezed it in a vice a little so that it was a tighter fit on the splines.
Cheers
Stot
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1.6 Mazda B6 : Garrett TBO339 : 420cc WRX Injectors : FMIC : Microsquirt V3 : LC-2 Wideband : Toyota COP
Build Started Jan 2013 : OTR Aug 2014 : Build Pictures
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