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loose balls or retainers?
one possibility might be a faulty ball
as an experiment you could repack with all new balls, making sure you have eleven per side, and see if there is a difference...
another thing you could do is to face the shell
with symptoms of this sort i like to do the easy straightforward stuff first. if that resolves it you are done. if it does not then one needs to vector deeper...
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Last edited by juvela; 06-08-20 at 08:39 PM.