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Dolls head adjuster bolt

Submitted by david_cooper on Wed, 08/07/2020
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A dolls head adjuster bolt made a successful bid for freedom the other day.  I have just received a new one (i.e. bolt + cross bar + retaining screws) from RGM.  I intend to cross drill the retaining bolts and lock wire this time (could be tough in stainless steel).  But I see it has a locknut on the long threaded portion.  I'm sure my old one did not (probably why it escaped).  Does the nut screw up against the back of the top gearbox bolt?  I expect I'll find out when I try to fit it, but I've not found a drawing of how it is supposed to go together.  Access is pretty tight.

Submitted by david_cooper on Wed, 08/07/2020

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Thanks Michael.  I'll use my mini milling machine as a drill press... it's very rigid.  I think it's best to push quite hard quite quickly to avoid strain hardening.  Yes - I see Paul Norman's version.  I'll see if I can get a small spanner in but I don't think it will fit.  But RGM must have got the design from somewhere!

My original three-holed-plate cracked across the centre hole.  The replacement was new old spare from Russells.

Submitted by ian_soady on Thu, 09/07/2020

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.. but when adjusting the primary chain overtighten it slightly first then use the adjuster to push the gearbox forward to get the right slack. This takes up all the lost motion and ensures that when you ride the bike the extra tension in the rear chain doesn't pull the box back and undo all your good work.

I always err on the side of too slack rather than too tight anyway.

Submitted by david_cooper on Thu, 09/07/2020

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Thanks Ian - I remember this from my Dommie, but always need to remind myself which chain is tighter!  

I fitted the adjuster yesterday and of course there's nowhere to fit the nut that came on the long thread.  I can't understand why the previous one escaped, but I've drilled the heads of the two fixing bolts now.  I love my little milling machine as a drill press - went straight through with 1.6mm bit no problem whatsoever.

 


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