Thanks Rockey -
That's one way to do it. However your force advantage is multiplied by the cosine of that angle, which is always less than 1, unless the angle is zero. That is, when the lever arm is parallel to the bed in the actuated position, the cosine is 1, which gives the maximum advantage. I'm thinking if we were to extend the lever arm by epoxying a thin strip onto the existing arm, say twice as long, we could eliminate maybe 99% of the error. This already got it down by 15/2 * 100 = 86.7% even though the bend actually shortened the lever arm somewhat. While I've got this set up, maybe I'll try that and post the results back here. Thanks for sticking with me through all my fumbling around for twenty one minutes!