My friend has broken and replaced two tuning machines on his entry level Fender acoustic guitar. He asked one of our local guitar shops how much to upgrade all the tuners and they told him with labor and parts he might as well get a new guitar…and for what they would charge him, they were right.
I on the other hand do not charge labor. And I have tuners he can buy off me for cheap on an old knock off Les Paul that refuses to stay in tune because the neck pocket is not solid.
The old tuning machines were much smaller than the new ones so I got to use the reamer I purchased a while ago. It is so much nicer having the right tool at home rather than having to go visit my local guitar shops and rely on the generosity. Plus, it worked like a charm and in under an hour I was done.