Square four coupling gears thread size

[malcolmm]

Hi need help identifying the thread size on the coupling gears to make a extractor to pull the gears off.
Also thread size for the dynamo gear to make a extractor.
1952 Ariel square four MK1 4G.
Thanks Malcolm.

[Roger Gwynn]

I would assume that if you have the ability to make an extractor you would be able to work out the thread size using callipers and a thread gauge, both will be CEI. Both are commercially available. Works drawings for the coupling gear extractor and pusher, which is just as essential, are available to members for £5.

[malcolmm]

Thank you Roger i will order the drawings which will help me .
Thanks Malcolm.