Been away in holiday so had a few weeks away from the build. The poly bushes arrived which are 80 shore comparable to the standard rubber bushes.
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First pushed one half of the poly bush with the spacer tube into the bore.
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Pushed the second half in as far as possible.
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Used a plate drilled out slightly larger than the spacer tube O/D then press home the bush using a vice. The hole in the plate allows the metal tube to be correctly spaced with in the poly bush.