William Bagwell wrote:
...
BTW these grooves need to be slightly rough. While I want to avoid
splinters extremely smooth groves are not what I need or want. Nor do I
want any radius at the top or bottom of the grooves. This would defeat the
whole purpose of having grooves for the bats little toenails to grip

Bats? Just get some rough-sawn wood or take some very coarse grit paper and
rough up the surface. They'll figure it out. They're able to cling to the
ceilings of caves, you know.

If you want to make it a project, take a 12 TPI saw blade, clamp it between
a couple of pieces of angle stock, and scrape the surface sideways. :-)

Cheers!
Rich