I used a super lam sled I got from Kenny. He provided instructions on it and I promptly ignored them.
Not that his instructions aren't correct, I just started with my lam too thin so I stopped grinding before it was completely tapered end to end. So what I ended up with was part of the lam was parallel. From the butt (.079") it was parallel for about 12" or so, then it has a .001" taper. Then as it got back to the tip wedge I had about 4"-5" of parallel there as well.
Bear in mind that with the 12" on the butt end I cut some off because my tip wedge was about where I wanted it. This gave me about 8" of butt end parallel that went on the form, which happened to be right at the end of my riser so it worked out ok.
Next time I will start with a thicker lam to grind.
Yeah, I know, way more story than you asked for.