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Im having issues getting the reel sprocket off at the front - It looks threaded, pretty sure its reverse thread or the chain would unscrew it off.
Hello Dave
A warm welcome from me to these forums.
The Model 40 is a great machine.

Yes, sprocket will be a LH thread.
Generally, these may be quickly released with little effort.
A piece of softwood through the centre of the reel that jams the reel to the
bedknife is all that is needed. A tommy bar through the sprocket,
and a hammer tap should release the sprocket quickly.

History Record is here:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/84462/MODEL_40_-_14"_Reel_L.html

Engine Manual is here:-
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/84921/Re:_VILLIERS_-_Lightweight_Hor.html

Hope this helps.
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Jack