been there a few times with customers bikes, at first I use standard socket with cups, when that fails, after it should, sometimes an air gun forwards and back sometimes jogs undone. failing that, strap wrench, chain strap then its a screwdriver .
If you want a nightmare Triumph are your foe. a couple of times rear wheel removal and chain adjustment are a nightmare on the Alloy swing arm models with the 50mm eccentric axle mount/chain adjuster units. theory is good, nip up and adjust with large hexagon drive in hexagon in adjuster. trouble is, as not done very often and no lube used on the mating parts, the water acts as a glue and oxidisation between both alloy parts gets glued together like calcium on taps. I was sat with a customer for two hours one day trying to remove and adjust his chain, a copper and hide hammer were used in the end along with emery cloth and grease on re assembly.
