M68 LOCK NUT AT THE END OF PE2M FLY WHEEL SHAFT.

According to the machine manufacture.  The flywheel shaft end had used 2 different sizes lock nuts.  (M68 and M70). 
Please check with your lock nut size to ensure the one on your machine is also M68 (68mm diameter) before your purchase decision. 
Due to the cost of operation, we do not offer return or exchange if you picked the wrong nut.