Question for Watchmakers: Opening up the sleeve diameter on an hour hand

I have a problem with a handset for a vintage watch. Everything seems fine apart from the hour hand, which has been measured as 120 whilst the movement spindle is 145. I know it's possible to open up the sleeve diameter on a hand, but I don't know what level of change is possible. Could anyone here estimate whether going from 120 to 145 should be a) fine, b) borderline, with a risk of splitting the sleeve, or c) completely impossible and stupid to try.

I will take all the risk, so don't worry if you say "a" and then I split it trying !

Not understanding the scope of your project, Ive actually had hands that would not fit a replacement hour wheel. I ended up getting the watchmaker to turn the hour wheel down a little.

Could be a good idea... the hands are like rocking horse poop, whilst the movement is extremely common.