Per Brian Nystrom:
For that matter, you can use tube patches to repair rips and holes or to
reinforce damaged edges. However, it's not difficult to replace the seal
and be done with it.

In the past, I'd been doing my neck seals on the hood of my car: lay it flat,
use 30-40 little magnets to hold it all together. My best time was about
45 minutes for a neck seal and 2 wrist seals.

Just did the last two neck seals with the jigs that Kokatat describes: a ring, a
plate to clamp the ring to, and a smaller plate to give the top of the seal some
shape.

The wood I cut the jigs from was way too thick - about 3/4"... Didn't put a
clock on it, but it was pretty impressive how simple the process became
alignment-wise.

If I can find some 1/4" polyethylene sheet to cut another set of jigs from, I
think it'll be even easier bc the only downside was having to separate the
seals/dryed glue from the wood.
--
PeteCresswell