"Evan Gatehouse" wrote:

I've got to put in some new thru hulls and of course the stem length of
the fitting is about 3" long. The hull is ~3/4" thick, the portion that
sits in the seacock is perhaps 1" which leaves 1-1/4" or so to be made up
with backing pads. This is a bit excessive to me and probably dates back
to wooden boats with 2" thick planking!
snip

I'd want at least a 3/4 backing pad to allow for hull curvature, so based on
your estimates above,
you want to go thru all that work to save 1/2"(1-1/4 - 3/4")?

What's the benefit?

Lew