Nan,
If you can, get your DH to cut that out. We have too many perfectionistic kids who are wearing through their papers as it is. Perhaps you could compromise by having him write double spaced, and drawing a line through the ambiguous digits and re-writing them on top?
Jus my .02$ - my handwriting has taken a very long time to develop!
As for 'hothousing handwritting' - if your son wants to, then go for it!
I like 'handwriting without tears' - particularly their 'The Print Tool' - it's meant for professional, and it really analyses what the weaknesses are to be focused on. Perhaps your OT has already done that, and could give you some things to do as practice at home?
There are also the 'other' activities that build finger strength, such as musical instruments, woodworking, handicrafts that you might pursue to try to hothouse the printing a bit.
Best Wishes,
Grinity
