In article .com,
Dave Eames , Oakhurst CA wrote:

Dave, this is cool, thanks!
a few questions:
1) is that a 1/2" bit?
2) how do you make the first cut, do you just hold the stock up against
the peg?

1 - That particular bit is a 3/8", using the 3/8 adapter from Lee
Valley in a 1/2" collet. This one, I'm using some cherry that's been
resawn and planed to 3/8 so that's what I went with. I think I'll just
build more sleds for different bits as I need them, it was easy fast
and cheap.

2 - Yes.