+1 for the reliance on the expanding inserts being a poor design. On both of mine they had caused the front rim of the binnacle to crack. On my current TF I reinforced the plastic rim with some curved pieces of metal. I used some b8ts left over from fitting a car stereo ( looks pretty much like a strip of meccano ).

If you do need the inserts though then Darren at Bitz has some 2nd hand ones

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