Model A Starter

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I run a 6volt starter on my tourer but upgraded to a 12v system. the starter, unchanged at 6v, engages with a thud which is disconcerting. One person I consulted said remove 2 brushes from the starter. was this correct advise.
I might add the vehicle has broken two starter shafts and in time will possibly brake the current one too.
how do I address this??
with thanks in anticipation, gary