You are correct, it's difficult to keep things square when doing it by hand, and new shoes aren't terribly accurate to begin with.
Chalk the shoes to get a contact pattern; your shoes will likely be fat in the center due to the larger drum diameter. I shoot for at least 90% contact area when done, you can leave a slight margin at either end of the shoe, if it's the usual case of a smaller shoe radius than the drum.
: I mentioned in another post that after
: sandblasting we found cracks in one of
: the two drums.
: I was fortunate and found I had two
: extra drums in my stash of parts.
: These are corroded so I will sandblast
: them at work tomorrow. Tonight I took
: the drums and cleaned them up enough to
: put them on my mill and rotary table to
: "turn" the inside diameter
: (my lathe isn't big enough to turn
: drums). The inside of the drums
: cleaned up OK but they are at the wear
: limit. I anticipate needing to arc the
: shoes like Glen said so they fit the
: drums better.
: Glen, I'd appreciate any additional
: comments and suggestions you care to
: offer about how to do this by hand. I
: have read that some people just bond
: the sandpaper to the drum and rub the
: shoes against the drums by hand. I can
: see that getting out of square if I am
: not careful. I also have a rear hub
: assembly (from which I took one of the
: two drums). I was wondering if it
: would be faster/better to mount the new
: shoes in there and use it as a fixture
: to hold the shoes securely while
: rotating the drum with sandpaper. What
: do you think?
: Doug L.