Many pivot holes in Big and Baby Bens have a curved recess inside the front plate. I use KWM brand bushings for the small sizes such as #59, #5 and #6. I recommend "American System" bushings in KWM sizes (available from the major clock parts suppliers), for the larger bushings such as #13, #21 and #26. Use KWM sized bushings, DON'T use Bergeon bushings! Bergeon bushings require a large hole to be reamed, and it looks bad. Sometimes the oil in the balance screws turned rusty, and I think it was because there was too much endshake, causing the point on the staff to revolve in the less well finished part of the screw, abrading the point.
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