pole saw

I've got a Polan Pro PR 28 Pole Saw that the throttle stick wide open. I've taken the throttle cable off the carburetor and it works just fine. I put some oil down inside the cable housing to see if that would help, but it didn't. The cable doesn't seem to have any issues, it seems to move...

While a user was generous enough to direct-message me with similar-enough Echo pole-saws, which did let me successfully complete my 'Broken-in-half 266 to working-and-stronger-than-OEM 266'(though it is like 5lbs heavier now, w/ all the excessive bracing I did to the shaft!!) \ However now...

Looking for a service manual please or advice on removing the threaded drive shaft from the clutch drum. Thanks in advance.

Looking for a service manual please. Or advice on removing the threaded drive shaft from the clutch drum. Thanks in advance.