I changed the rear discs on my 54 182 today, and now there is a metal on metal noise when going round corners. I inspected it after a test run and I sounds like the rear disc Is making contact with the hub (?) at a certain point on the rotation. When I removed the old discs there wasn't any spacers fitted, I just replaced them exactly as they came off. The locking nut is torqued correctly. Any ideas anyone? Can't seem to find any info about needing spacers from any parts dealers. Thanks.