18 1/4" Space it down if you gotta.

I will go ahead & say what I had in mind was between 17.5 - 18" which would put me 3 13/16" @ 18" & 4 3/8" @ 17.5" below the bottom

I didn't really want to say that to start with b/c sometimes that has a tendency to influence what somebody may come up with... I appritiate all the info given

Anybody else want to give a little input ?