I have had a roll repair table for probably 20 years. It's a necessity
in this business. I'm glad that I didn't have to make the table in a
curved cylindrical shape. I would have never built one.
Luckily, none of that is necessary, and I want to assure everyone to
build their roll repair table flat! If you put a curve on it, you will
not be able to repair long tears nearly as easily, and the curve will
avail you absolutely nothing, anyway! Don't make things harder than
they have to be. Don't worry, the rolls will spool back up perfectly
and stay fixed indefinitely.
You have to lay a straight edge down tightly, place the new roll paper
under the long, torn edges, and keep both ends of the ruler flat and
tight, clamping both the roll paper and the new replacement paper
while cutting them very precisely. How would we ever do this if our
table was curved? It's hard enough to do on a flat table, and it takes
a certain amount of skill and a precise eye to cut a perfect new paper
edge. Flat is good! Do flat!
[ A tip of the hat to the "Flat Earth Society"! ;-) -- Robbie