wrote in message
...
make 'em as you need them. size is determined by what you are clamping
and curvature will depend on what they are made of and how much
pressure you want to distribute.

so here's what you do.

select a stick of wood to make a caul from. it should be a little
longer than the thing you are clamping, wide enough to not dent your
workpiece and a little taller than you need, so that you have
something to take away to get your curve. that piece of wood should
also be a scrap from something else. it's a spiritual thing.


No sense of spirit here. Pipe clamp cauls should be of bass or aspen,
something which can take an asymmetrical load by deforming, not splitting.
Don't use those pieces of SPF crap you have left over in the garage.

In the BB (Before Bessey) days I bored a hole through one end of the cauls
and captured them on the pipe so I had them always at hand. Touch of the
hot caulk to adhere them to the clamp faces themselves would do for a few
knocks.