Ok - I'm working through a number of options on this and tonight re-visited
the poly bushes. They really don't file at all though after a very long
time one of them was getting closer to being the right size for the trunnion
bolt.
However, since I don't have a couple of days to file them, a drill didn't
work, I don't have a reamer or a lathe I tried an alternative approach.
Using a scrap/damaged trunnion bolt I heated it with a blow lamp and then
pushed the bush on it and ran it up and down. Then I cooled the poly bush
and picked off melted debris and gave it a quick file. I repeated this
process several times on the first and the second bush. Sure enough after a
while both bushes are now a good fit on a new trunnion bolt. It's possible
I might need to 'heat-ream' (a phrase I believe I've just invented) each
bush once or twice more depending on how much they compress when fitted to
the trunnion - but that will be a project for tomorrow night.
Weslake-Monza 1330
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