The problem is with a Jane Trider pushchair so it's not exactly a Bicycles question, I'd love suggestions for a better place to ask this. But all the parts are like on a bike, only they are attached to my daughter’s pram.
A short summary is that an unusual wire has snapped, I have a few ideas how to fix it but each idea has an issue with it.
The brake is based on separate wires for either wheel and a lever pulling both wires at the same time – please see the photos below. All photos are taken after removing the snapped wire. The original wire is approx. 1mm diameter, the balls are approx. 3mm diameter, and the gap between the two pins in the handle is only a little less than the size of the ball. Each wheel has a fail-safe spring, which pushes a locking bolt into a slot in the wheel unless retracted by the handle. One of the wires has snapped, so I had to remove the spring and bolt and we are down to one braked wheel. I’m not sure why the wire snapped as they really do not carry that much load (not the braking force anyway). I can only think it was fatigue worsened by gradual wear from rubbing on the two silver pins holding the ball in the handle. There is an original replacement available for £25 + £2.99 delivery, which seems a bit steep considering the amount of work then involved in routing the replacement cables. I would much rather spend that money on some tools and replace the wire myself. Below is the solution I came up with together with some specific questions to keep SE rules happy, but if someone has another solution then I would love that too.
For the record, one of the questions I have asked myself is whether it snapped at the ball or not; the answer is I can’t tell for sure because I’ve already removed the snapped wire from the black cable, but it probably doesn’t matter as it’s definitely too short to just put a new hook/ball on it.
So the best solution I can think of is this:
- Cut the “first” 50mm from the handle end of a bike brake wire
- Feed through the two pins in the handle so that the cylinder on the bike wire imitates the original ball
- Join the remaining part of the old wire – and here is the question in my post, how do I do this?
- One or two wire grips or clamps (like shown in the annotated photo below, the orange part is the saddle) – different styles exist but the smallest I can see online are for 3mm wire, way too large. I could make one to imitate how wires are held in brakes and derailleurs, but can’t think what to make it from.
- A lap splice – but I can’t think of a way to secure the two wires other than by super gluing
- A coupler of this sort used for rebar – but I can’t find any for 1mm wire
- A swage crimp – but I’m not convinced the crimps for electric wires have enough grip, and general mechanical ones don’t go down to this size.
Can anyone suggest how to overcome the issue with one of the above four options? Or can anyone suggest a better fix? I don’t fancy replacing the entire handle etc.