This afternoon i decided to top up the oil in the rear shock preload adjuster, and on the advice from someone on another 1150gs site i topped it up with atf fluid. Luckily after assembly, i started to screw the preload adjuster in to check it was working better, everything working good until the last full turn of the adjuster when the seal on the collar above the spring went pop and spewed oil out everywhere. Question is: what did i do wrong, and can the shock be stripped to replace the seal. Glad it happened on the workbench and not on the bike.