Ah yes. You are so right.. , but I just bought another reamer (a metric one) so I knew just where to go..

But, one thing that my instructor told me when I was trying to outfit my RC, at least initially, was fuel, some sort of way to get the fuel into the tank, a glow starter of some kind, a chicken stick, AND a reamer.

Basic tools, of course also were a necessity, but the above items were pretty much a requirement. It's pretty difficult to get a prop with a hole that is to small on to a shaft that is to large...even by a 1/2 mm. You can force it on, but good luck getting it off. And beginners are gonna break props, there's no getting around that.

And, remember that there are metric and standard (SAE) reamers. If a hole is reamed out with the wrong reamer, it now becomes to large for the shaft and will not center properly.. become wobbly, same as being off balance, which, in reality, is what it is when it is off-center.