the only adjustment to your machine should be to slightly tighten the tension and presser foot pressure. Having said that, make sure the buttonholer is oiled and greased according to the instructions in the manual, that a template is installed inside the buttonholer and buttonholer is firmly screwed down to your machine.
Without the coverplate, you may have to increase the presser foot pressure quite a bit to allow the buttonholer to move the fabric, especially if it's light weight.
Last edited by Tom W; 05-24-2015 at 07:37 AM.