I am working on a chair project and the angles are not 45deg. I tried the painters tape glued to painters tape with the cutoffs but it did not hold. I them tried clamping the cutoffs to the members to then clamping against across the assembled piece. It worked ok but not great. I have seen people use the old wooden clamps as blocks to clamp against so I may try that next, if I can find mine (never actually used them after dad gave them to me). I have the Rockler and Woodpecker 45deg clamp blocks, but they will not really help here. Any suggestions?