I thought I would put this final note into my above notes about the drive ratios on my 1917 2 3/4 model W.
Thanks to all members who contributed to solving my problem - which I have now done.
Bear in mind, as I said before, that I used all the original parts on the bike, as it had stopped 40 years ago. I am not sure how the owner then managed it with the high ratio, except that perhaps he lived in very flat country, and somewhere along the line he had had to put in a new flywheel sprocket (and could not get the correct one). The parts book quoted 3 sizes, 16, 17 and 18 tooth. My bike had an 18 tooth as stated before. Whilst I live in pretty hilly terrain, first gear was still much too fast. I had a drive ratio of 9.5 to 1 in low gear, and the bike could barely climb a gradient of 1 in 9. I was fortunate enough to find a 16 tooth sprocket in the club parts department, which I have just received and fitted. This now gives a low gear ration of 11 to 1. Well this is now about right, and the bike will now pull up my hills okay.
I know this all looks as if I may have now under-geared everything, when one looks at the information supplied above, but I still have the facility of being able to close up the drive pulley on the belt drive to increase the ratio should I find myself in flat country.
I could find nowhere in any manual any indication of the correct sprocket for the cork type clutch setup, but I am now happy that I can ride the bike comfortably on a reasonable road.