Hi to
gavin351, and a warm welcome to the forum.

It is always great to have another Scott Bonnar owner on board as we all like to learn new things and tinker here.

Many thanks to
CyberJack and
Bonnar Bloke for their replies. I have taken BB's idea on board and have renamed the topic to better reflect the problem at hand.
I tend to think that this could be an adjustment problem in as much that the clutch handle and associated clutch fork need adjusting at the clutch fork.
The dis-engaging of the cutter clutch works by pressure being applied to the plastic thrust pad by the clutch fork.
This in turn pushes the clutch cone inwards and away from the outer clutch cork lining thus dis-engaging the clutch and stops the cylinder reel from spinning.
If this adjustment is out of wack, the reel will spin sporadically or all the time, creating a dangerous condition.
Looking forward to seeing your pics....
Once again,

to
ODK 