I recently sold my SLR650 to a mate (on the understanding that he will sell it back to me when my finances improve) and offered to sort the rear suspension linkage for him as I knew it was mostly seized. Well, I wish I had kept quiet. The bolt nearest the rear wheel was a pig to get out but nothing compared to the one at the front. The bolt had totally welded itself to the sleeve which passes through the bearings. Much work with a grinder, heat and 2lb hammer and the shackle is out of the frame. However what remains of the bolt is still stuck in the sleeve!
Next time he's on his own!