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Double Bass Upgrading Tuning Machines

You will need to have the pegbox cheeks routed to fit the hatpeg shafts, which are significantly wider than the metal shafts on the stock Shen machines. I've put all-metal Rubners onto a Shen and it's a definite upgrade, though not necessarily a DIY job.

When I have the cash, my Shen will be getting a set of Sloanes, which can be had for not too much more than those Rubners if you have a good source.