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I suspect Ken is right about the quality of Gerben work look at my 500 carbs!

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McCabe-Thiele (Ted):
Okay I managed to dismantle the carbs & the shaft after drilling out the retainer rivet though my drill went very slightly off center as I do not have a pillar drill.

I did notice that the brass bearing on that side is not a full one like the other end of the bracket - see photo. Can't understand why it does not have a full bearing with a hole for the rivet. If you zoom in you can see it's closed to half a brass insert.

The shaft has cleaned up a tad - the rust is restricted to the outside area of the shaft not where the bearings & various parts fit. Not sure what to do with it tbh.

The centre quadrant type part is pretty clean but it's only just holding together tbh by two rivets - it does not appear to be out of shape or damaged likewise the throttle clamp looks okay - the two bolts that hold it in place with the fuel pipe bracket were such that when loosed it was straight - might have been just tightened up wonky or the split quadrant put some side pressure on the throttle cable action.

.bearing end  rivet by Macabe Thiele, on Flickr

.throttle shaft by Macabe Thiele, on Flickr

Oddjob:
That's not good Ted. The bronze bush appears to have broke in half. If it was meant to be like that the edge would be clean but that's jagged and you can clearly see where it's broken off from the other part. That part I suspect came adrift when the shaft was removed, possibly when the damaged area of the shaft was drawn through it. Any sign of the missing piece?

As for the shaft, not a great deal you can do with that TBH, whatever you do will come back eventually. Only option is to get it replated, trouble is with what. If you go with BZP you'll need to remove whatever is left of the original finish I'd imagine, plus you then have the problem of if you overplate it the shaft won't fit through the hole where the bush is. When I had my last 2 shaft hard chromed they didn't grind down the parts of the shaft where the 2 woodruff keys fit. They did grind them down but just not as deep as the rest of the shaft, mainly I think because the edges were chipping (which was evident on all the shafts where there were holes in the metal, like screw holes etc) I had to put the shafts in a drill and gently sand them down with some very fine wet/dry until they fitted without catching. Bright decorative chrome may work but more chance of it rusting etc later on.

The other alternative is to replace the entire bracket. Solves both problems. However any old bracket is almost certain to have shaft pitting.

I had the same problem when I started on my carbs, the shaft was so badly pitted I had to buy a NOS one from DS. His last one as it turns out and when it arrived from America it was missing parts they'd robbed to sell. DS replaced them all after a little bother. CMS still have one left, price is an eye watering £906.52 plus P&P. After customs best part of £1000. Ds price £1002.29 plus P&P. Just spotted this.
https://www.ebay.com/itm/314117753958 doesn't post to the UK though. Might be an alternative solution though.
As it turns out I'll not be using the bracket as I'll be building one up with a hard chrome shaft. Not sure if I want to sell the NOS one TBH, might do if the offer is right.

You think yours was bad, look at my old one.

McCabe-Thiele (Ted):
The bearing is as it came apart Ken - shaft pulled out by hand all done inside a large plastic  box I use for such dismantling - no debris aside from the drilled out retaining rivet when I removed the shaft.

I cleaned the corroded section and pulled it out away from the pinned clamp.

Looking at the inside of the bracket there is a large cut out section where the pin fits imho it was re-built with a half bearing by either Gerben or a previous owner as the remaining area aside from the pin rebate is not jagged.
Only way I can see to save my bracket is to have a brass bearing made with some reaming - expensive. Once the shaft is in place it could be painted & used. They are pretty much hidden away so not a Biggie.

Oddjob:
Sorry Ted, I forgot Gerben had already done this. So it's clear he did remove the shaft at some point, possibly he was a little hamfisted and broke it when he drilled the old rivet out. Which seems to be the case as the break is right where the rivet goes and the hole looks bigger than it should be.

I'd just replace that bracket Ted. If Bryan hasn't got one I may be able to sell you one of my ceramic coated ones, or I have one right now from a set of 550 carbs, same bracket, that I've just pulled apart. Just the bracket, no rod etc.

McCabe-Thiele (Ted):
Its a shame no one is selling the brass bushes for the throttle shafts.

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