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Thanks Joe,
I know that Teflon is a wonderful material as I've been using it for various things for many years, but it is also a weird material as it has a couple of phase changes where its crystal structure changes reversibly. One of those phase changes happens at about 20 degrees Celsius and I don't have information on what amount of volume change is involved with that.
The focuser is in the oven right now. I'll report back.
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