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Reasonable expectation...............
On Friday, September 15, 2017 at 7:30:42 PM UTC-7, John B. wrote:
On Fri, 15 Sep 2017 19:59:27 +0100, "Ian Field" wrote: "John B." wrote in message .. . On Thu, 14 Sep 2017 21:33:17 +0100, "Ian Field" wrote: "Joerg" wrote in message ... On 2017-09-14 10:42, AMuzi wrote: On 9/14/2017 12:32 PM, Ian Field wrote: The bike I built up on a frame I dragged out of a hedge has a seized seat post. So far; I've slackened the clamp bolt and give it a squirt of PTFE penetrating oil at least once a day - is there a reasonable expectation that it might work loose? Thanks. Yes. The vibration and cyclic loading of the post can free them. Not always but well worth a daily shot of penetrant and some miles. Leave the bolt out and cross your fingers! Might sing soprano after it let go all of a sudden :-) Its seriously stuck, it'll probably need a lot of twisting to shift it at all once it starts to loosen. If I still had a welder, I'd weld a lever arm to it so I could apply enough force. If it is an aluminum seat post in a steel frame and you can't budge it with a, oh say 24 inch pipe wrench, after a few days of penetrating oil then it probably won't come out without some serious attention. I once spent nearly a week to make a boring bar and boring out a stuck seat tube after all else failed however after reading the Internet I discovered that dissolving the aluminum tube using lye would have been much easier :-) No aluminium - and I wouldn't want a glob of corrosive **** running down into the BB bracket if there was. You are supposed to disassemble the bicycle before you start :-( From the Internet: As a strong alkali, sodium hydroxide will attack and dissolve the following metals: Tin, Aluminum, zinc, cadmium - behaves closely enough to zinc. It will also attack chromium plating and copper, although ammonia is far better at dissolving copper: The reaction with those metals releases hydrogen gas. Sodium hydroxide will not react with iron or steel, in fact the alkaline conditions will not allow rust to grow; What would you use in a frame that has been fully chromed? |
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