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Old 05-11-12, 06:23 AM   #1
skoot
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Brompton front hinge spindle problem

My (relatively low mileage) March 2000 5 Speed Brompton has a loose front frame hinge. I've bought a new hinge spindle pin but can't get the old one out. Unlike most of the Brompton parts I've bought, this one came without instructions.

From what I can see, the existing spindle looks different. The one that's installed has a couple of split sides at one end whereas the new one just has ridges at one end. There one nylon washer on one side but not on the other - not sure if one has worn away or was never there?

I've tried using a bolt, G-cramp and some wood (to protect the paint) but can't shift the old one.

Extensive searches have only found info on the rear hinge which is OK on my bike.

Anyone got any experience of this hinge (same as handlebar hinge?) and how to remove the spindle?
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Old 05-11-12, 08:40 AM   #2
jerrysimon
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I am not sure that one is user servicable ?

Have you asked the question on the Brompton Yahoo forum ?

Regards

Jerry
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Old 05-11-12, 08:47 AM   #3
skoot
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Well I looked at the part:

http://brilliantbikes.co.uk/brompton...099040056.html

and thought that it looked OK to push out the original part and then push this one in.

Will look on yahoo thanks.



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I am not sure that one is user servicable ?

Have you asked the question on the Brompton Yahoo forum ?

Regards

Jerry
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Old 05-11-12, 09:06 AM   #4
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There was some talk of this at BromptonTalk a couple of months ago. Someone said that replacement hinge spindles should come in designated larger diameter sizes than the original, i.e. +1, +2 etc, so that the slack of the worn frame area is taken up. It appears to be intended to be a factory job and I'm not sure how one would put a new spindle in. . . a thingy press is needed to deform the spindles ends. Dunno if there could be a home solution. . . perhaps there is a cheap hand-press device that'd work?
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Old 05-11-12, 09:12 AM   #5
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aha, it makes sense now that the ends need to be opened up so it can't fall out. That probably explains why the fitted one looks different too. thanks.
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Old 05-11-12, 10:07 AM   #6
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I think it's called a fly press. Fietsbob or Jur will know this sort of thing.
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Old 05-11-12, 10:32 AM   #7
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Yea the replacement hinge pin as the original, was, is riveted in.
Shade tree version.. need to support the bottom, say have 2 punches,
to expand the hollow rivet ends, put 1 in a bench vise,
then hold the bike's hinge over it. [ probably need helpers on that]

and with the 2nd punch, and a hammer, you will be expanding both rivets at once.


if you have resources, a big Pole or C clamp's jaws could be modified
by a welding shop,
to have pointed punch tips ground out of steel rod, then welded
to the jaws.

perhaps just a bit more rivet head 'upsetting' will tighten up
the existing hinge pin..

Last edited by fietsbob; 05-11-12 at 10:37 AM.
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Old 05-11-12, 10:43 AM   #8
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thanks Fietsbob. Sounds a bit beyond my abilities.

Is this the sort of thing a Brompton dealer can do? Any idea on a cost for this or a factory return?
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Old 05-11-12, 10:50 AM   #9
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IDK, Call the dealer, and ask there ..

the hollow rivet type is not an exclusive technology..

A Machine Shop may be able to take in the job
if you are a long ways away from a dealer to do the work.

Last edited by fietsbob; 05-11-12 at 03:22 PM.
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Old 05-11-12, 03:14 PM   #10
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What about carefully drilling out, at least the deformed end on the old one and then punched out, or drill out the whole thing?
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Old 05-12-12, 09:55 AM   #11
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Visited a bike shop in Cambridge today and they said they could replace the spindle for 15-20 quid. Sounds good to me.

Thanks all for your help.
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Old 05-13-12, 02:47 AM   #12
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I am in Cambridge. Was that Ben Haywards ?

Regards

Jerry
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Old 05-13-12, 02:56 AM   #13
skoot
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Hi Jerry - yes it was Ben Haywards.
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