From a suggestion I read [maybe] on here, I used a 50/50 mix of acetone/ATF and it worked on a rusted in stem after a good day's+ soak. The original test for this was in a mechanic's (not bicycle related) rag.
Their test found this mix worked better than WD40, PB Blaster, and Kroil.
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Last edited by Ex Pres; 04-27-10 at 07:49 AM.