This may not be the correct category but.... Is there a trick to making a mortise and tendon joint? I use a tendoning jig and mortise machine. I make both the same size. Sometimes they go together fine other times they don't. I really can't make the mortise a little bigger as the mortise chisel dictates the size. Does one need to make the tendon a little bit smaller both width and length wise or one or the other. Or, does making the tendon smaller create a problem.