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I would say that your job is to 'be the wall' and insist the he do some fine motor practice daily - it could be playdoh, musical instrument, typing practice, cutting up magazine picture 'whatever' but he must do something.
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Interestingly, he doesn't resist those sorts of things as much. The penny dropped! I actually think it is perfectionism coupled with insufficient knowledge. I probably should have done handwriting with him earlier, but I've been resisting direct instruction. Off to look at HWT! Maybe even the one for his younger brother, to try to head this off for him as his fine motor is actually quite good, and he likes drawing and things at the moment.
