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Old 9th August 2015, 08:59 PM
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Tench Tench is offline
WHFTA World Champion 2016.
Join Date: Sep 2009
Location: derby
Posts: 1,429

The nylon bit is a 3mm dia ball, this should be dropped in the hole before the screw, the screw then applies pressure to the ball which tightens on the pot threads stopping it from turning. Without the nylon ball the grub screw would flatten the tops of the brass threads making it difficult to remove come service time.
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