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1 Focus it then drill three holes x120 degrees through the thread and the focuser tube. Tap in some screws to fit and it won't move.or
2 Cling wrap over the thread then insert and wind to position - that will take up a lot of slack.or
3 Oil or wax the female thread and dry out the male thread - apply a thin layer of resin to male then screw in til set -... then focus as normal.
4 Screw dried male and female threads in to focus and then drizzle in some glue. allow to set
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