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Have you checked whether the chain rings you have (the Williams and the 5 pin for the Durax) are 1/8" or 3/32"? If they're 1/8" they won't work with the 5 speed block.
I should mention here, metric and imperial. I am definitely not a brexiteer, but I generally prefer imperial measures. This is especially the case when the subject to be measured was made to imperial measure. So if an English frame was made as, say, 21" I find it irritating to see it described as a metric size. Chains are a case in point since they are virtually all still 1/2" pitch because the standard was set in England. As to width, while 1/8" translates as 3 mm which is , at least, a round number, 3/32" translates as 2.38 mm, which seems completely random to me.
BTW I've been away for the past few days, and I'm off the internet (intentionally) when I'm at my other place. That's one reason why I go silent from time to time.
clubman-
As to width, while 1/8" translates as 3 mm which is, at least, a round number, 3/32" translates as 2.38 mm, which seems completely random to me.
except that 1/8" equates to 3.17mm.
I know that well from looking for a specific Simplex TdF rear derailleur. They were often stamped with the number of gears and the chain width each version was designed for.
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the Williams and the 5 pin for the Durax) are 1/8" or 3/32"?
Ah. Haven't checked. I don't have the chainset yet (hoping it'll be posted this weekend.)
Really appreciate the help, will try and see what the dimensions are keep fingers' crossed.
Big_Block
crossedthread
Hope it's ok to ask here about bb's?
Will be getting the Durax c/s off of the very nice @knowthejo, so with this single ring set-up in mind (and after some elbow grease to polish it up) should I be on the lookout for a Bayliss Wiley '15' cottered bb?
BB shell on the Holdsworth is an RGF 68mm English thread, have a 5spd block and a Gran Sport r/m dibs to buy at the end of the month.
Have been trying to decipher things from various sites (to do with gear cases, chain clearance, chain lines and bb widths of an extraordinary variety) but any experience / definitely do not's very welcome.