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[QUOTE=TIPN8R;5367740]You need a spanner wrench and also try the flat sides of the piston to grab it.
+1...IMO...GOTTA HAVE A SPANNER OR EQUIVALENT TO HOLD THE ADJUSTING PLATE WHILE BACKING OFF THE JAM NUT. MAYBE A SHARP TAP WITH A HAMMER TO THE WRENCH WILL POP THE JAM NUT LOOSE FROM THE ADJUSTING PLATE. AN EXTRA SET OF HANDS WOULD BE HANDY RIGHT ABOUT NOW. KEEP AT IT AND IT WILL EVENTUALLY BREAK LOOSE. BY THE WAY, ONCE LOOSE THE CANISTER AND ADJUSTING PLATE ARE LIKLY TO TURN TOGETHER WHILE YOU ADJUST. THAT IS NOT A PROBLEM!!!
After loosening the jam nut I put a 9/16 wrench on the flats of the stem and braced it against the frame. I couldn't budge the adjuster plate with the spanner so I had to use my foot on the spanner! It still didn't want to turn with pretty firm pressure. I didn't want to push any harder cause I thought the bike would tip over on me or I would at least loose some skin. Maybe it needs anti-seize or WD40?
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