Generally, soaking it in CLR or similar does the job. - Mike
Ron,We replaced the screws in the shower awhile back. See my post http://www.phoenixusarv.com/community/index.php/topic,1876.msg14578/topicseen.html#msg14578
Tom, you are correct about that being much easier, but using Vasoline is the official lubricant for potable water, and I assume we all appreciate potable water to take a shower with.In all honesty, Tom's method exposes the human body to so little questionable chemicals, I would think that is fine.