Yeah your 17,000 circlip is correct since it is a Model 2,So you have to go on the Majority and accuracy of that Model,Not so much what part variants carried on from the Model 1 to the 2,valid as they are. But in all reality the real transition happened when the serial changed. So yeah your 290 mm is a model 1 base carry over as well and since its 17,000 im not surprised...So we both have early model 2 examples with model 1 bases.
Ive stated my opinion on the Screws a few times,that they all came with 2x 3'16 Machine screws and nuts,so ill wait for more evidence,especially since this Ad shows a Model 1 With Plastic Wheels! And Id expect to see solid steel or alloy Rivets,NOT pop/blind rivets for this period as the Ad is showing....But yeah a couple more Images might give a clearer picture,and we do have a few original examples in the Roto forum using Identical screws. But Ill stick With Screws for Now....Why? Cause your going alloy and we cant have fun debating if I go quietly along with you! LMFAO...Naaa we will sort it out soon! muffles under my breath...Screws...Screws....shhhhhh
