Can't you just use the adjusting nut to belay the locknut? i.e., hold the top one while you break the bottom one free... maybe I'm missing something. Good luck, in anycase!

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Ash Peltier - tools, truck, tales
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1982 240D - (272,000)
1998 Honda VTR1000F(RT) Superhawk Freeway (58,000) "Madrid"
1996 Toyota T100 4x4 (84,000) "Mary Kay"