The rules also require that when in the set position the pivot is to be within the ends of and parallel to the rubber. Custom and practice typically allows up to perhaps half the foot to extend beyond the ends of the rubber---especially so on poorly groomed fields.
If you give them and inch and he wants to take a mile, talk to pitcher to correct the issue before considering any penalty. Let him know what criteria YOU are applying.
Just my opinion,
Freix
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