Join Date: Mar 2005
Location: Washington, DC
Bikes: Redline Conquest, Cannonday, Specialized, RANS
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The loctite green will set you back about five bucks, for a quantity that will last you a long, long time in personal use. Buy it, you'll use it all the time once it's handy, and you'll never have nagging doubts. Buying a specialized tool for a one-time use is a different story, you should be able to improvise something that should do an acceptable job.
I would say the difference is between doing a job where you're 99% sure it will hold up, and one where you're 99.99% sure. If you're just working on one bike, and you're the one who's going to fix it anyway, it's OK to cut the corner. The worst that could happen is the bearing loosens and you have to tighten it up later. If you're working on thousands of bikes, and the potential cost of failure is high, you go the extra yard.