Drums are statically out of balance, i.e. there is more metal on one
side due to casting/machining tolerances. To correct this only
requires basic tools like a file and some patience, or take them to an
engine balancer. I prefer to file a small amount over a large area so
they don't look any different to originally whereas jobbing shops may
use a drill to remove metal and it won't look original if that
matters.
Andy.
On 2/20/18, Keith Pennell <llennep at verizon.net> wrote:
> I did not understand that the drums were shaved, but the tires. Shaving
> drums merely makes it round around some point and nt necessarily the center
> of mass.
>
>
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