Just picked up my first Jonsereds 621 and after some good cleanup and carb service, it’s alive and well again. Looking to see if a Jonsereds 2051 clutch cover would fit on it. I’m wanting to add another felling spike to my 621, and can’t seem to find one to add. Any other suggestions would be appreciated. Additionally, what is the largest bar that should be run on the 621? Manual I have states these are 60 cc saws. Thank you!