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@Joseph
Something along the lines of this then?
Haven't got a clue what those bumps are - it says it's a track chainring on the site I got the picture from, so can't be anything to do with gear shifting
I now begin the arduous task of honing in on what sort gear ratios I'll be needing - tedious! But thanks for the offer, I will let you know if I'll take it off of your hands soon