I am having issues with my BX 2370 failing to start. At first I could "rock" the treadle back and forth a few times and the tractor would start. I grease the treadle frequently. I began to suspect one of the safety switches were not working properly, and suspected the neutral safety switch. I found the location (behind the right rear tire), and worked the pedal back and forth to determine how the linkage worked. The "tab" from the linkage is barely making contact with the safety switch plunger. I can depress the plunger and it will start, so the switch is not bad, just out of adjustment. The plunger is not binding or sticking, it seems to move freely. How do I adjust the switch to work properly?