I built a half dozen variable V-blocks in a little more than an hour with a table saw, jigsaw, and drill. These are quite adequate for holding tubes off of a surface, although I wouldn't want to get an oxy-acetylene torch too close to them. I use a caliper between the "V" and the bottom to get the desired standoff distance. I let the widest part of the frame (almost always the rear dropouts) rest on the surface, and use the V-blocks under the seat tube, top tube, and down tube to get the rest of the frame parallel to the surface. I've found just that measuring from the surface to the centerline of each tube using a scale gives me very repeatable results (no height gauge needed).Mike T. said:I'm dealing with this one right now Stan - mostly for the reason that I don't have to remove the fork from the frame.
I've taken many measurements and it makes a major difference if the fork is level and perpendicular when the two marks are made. I'm using a spirit level on the fork legs to make sure. I wish I had v-blocks and a Mitutoyo height gauge