No do not open the foot peddle. I ruined mine doing that. It’s electronic and there isn’t anything to adjust or fix. My problem turns out to be where it plugs to the machine. I have a Pfaff 7550. My repairman, an independent service person, did something to the plugin to make it work. But I still have problems. If the cord of the plug isn’t running towards the back of the machine it might run or might not. I hope this might help you. I need to check and see if the plugin can be replaced.