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Hence the work I did when I had the holder apart recently to install the dew heater:-
"While waiting, took the opportunity to do some work on the mechanicals. Took any sharp edges off the end of the central mounting screw since it may screw through the holder into the cotton wool packing. Stretched the spring a little to give a bit more rigidity. I noticed that the three collimating screws had been chewing into the washer. One at a time, I removed and cleaned up the ends of the screws, finally with some fine emery paper until they were silky smooth. Filed down and used emery paper on the washer to get some removal of the deep gouges, and decided to fix it to the end of the secondary holder with a few spots of silicon. Firstly to stop it falling off when removing the secondary holder. Secondly to make the three collimating screw ends contact clean metal away from the early marks which covered much of the surface at the radius of contact."
Take the screws out one at a time and file the end to remove any sharp edges, then emery paper it until smooth and flat, then replace, the remove the second etc.
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