I replaced the bearings in 2 MP10 dry sides last year
For me, total waste of time and money, even with the best (brand/style) ones recommended in the
MP40 threads, and the supplier's lube
Plus, one of the bearings I received was pooched right out of the shoot
No improvement in sound, and a new dry side was my fix
In the linked thread you'll find the bearing #s for your MP40 and where to buy them, along with some tools if you like
To remove the bearings I hung them in a small vice and tapped the shaft out with a punch
For pressing the bearings, I used the vice and a socket that matched the inner race
Tapping them out is tricky due to the magnet
If you do decide to go this route, make certain you 'press' the bearings
I know you asked about it so you must be aware, but, I'll state it anyway
Hammering/jolting the new bearings on will more than likely destroy them
Plus, you must be careful not to damage the magnet
Lots of info in the link and there's a step-by-step how-to on the first page
Good luck