English Range Rider
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I would fashion an aluminium plate and pop rivet in place, won't be pretty but should be plenty strong.
Yes, there's plenty of clearance on the inside for plating up, but I'd like to keep it looking as clean as possible on the outside face.
Rivets will definitely be a backup Plan B if needed.
The hole near the end of the guard is where if fixes to the rack, so there shouldn't be too much loading on the guard further forward.
I suspect it got twisted, rotated at the mounting bolt and cracked.
All the best,
Lostcause
Retro Guru
What an interesting bike, I’m glad it’s getting some loving attention. I was watching a YouTube video on the history of mountain biking and Geoff Apps is filmed riding one through a rocky river bed at one stage. He seems like a fun character. Looking forward to seeing more of this 
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Today I found some broken sections of the same type of Bluemels chromoplastic mudguards shown above, and set about to find out which of the solvents I have would be best to to repair them.
Methylene Chloride melted the surface but evaporated too quickly. To use this you would need to keep reapplying the solvent until it had melted deeply enough to achieve a strong bond.
Cyclohexanone worked best as it was far slower to evaporate and so melted more deeply into the surface. It could be used to chemically weld a patch made from old mudguard underneath the broken guard. It could also be used to dissolve old mudguard filings to make a gap-filling paste. Once dry a repair could be paired back with a very sharp blade, smoothed with wet and dry paper and finally polished with a mild abrasive.
If done well the result should be about as strong as the original guard but without any requirement to rivet or staple. Though it is unlikely to be a totally invisible repair.
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I photographed the decals using a long lens to minimise distortion and a tripod to eliminate camera shake. Each word was photographed separately with the camera positioned as square on as I could make it. Though this method eliminates a great deal of the distortion caused by the tube it does not eliminate it completely. i.e. the and top and bottom the horizontal strokes of a capital 'E' will be slightly thinner than a middle stroke of the same thickness on the original decal.
I doubt that there is specialist software specifically for such a niche purpose. However, there are 3D scanners that can record both the three dimensional measurements of an object together with a 3d image of its surface. To do this the scanner moves around a real object building up 3D computer model from every angle. It might be possible to extract the surface image data as 2D image map, which in this instance would be the tube surface unrolled until it became flat.
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OK, (slow) progress report:
Frame and decals back from the excellent Lucy Higgins at IndiBike: https://www.indibike.co.uk/
The delay's been my fault not hers. 3 sets made, also with @GrahamJohnWallace's Metro Trekker part.
Also, red cable outers have arrived. I suspect the originals would have been fat 6mm brake and 5mm gear, but I've gone for no-logo 5mm brake all round since it's Teflon lined and will operate so much better.
On to the repair
All the best,
Frame and decals back from the excellent Lucy Higgins at IndiBike: https://www.indibike.co.uk/
The delay's been my fault not hers. 3 sets made, also with @GrahamJohnWallace's Metro Trekker part.
Also, red cable outers have arrived. I suspect the originals would have been fat 6mm brake and 5mm gear, but I've gone for no-logo 5mm brake all round since it's Teflon lined and will operate so much better.
On to the repair
All the best,
Looking great Dan! Love the red cables… just like the originals! Very exciting!OK, (slow) progress report:
Frame and decals back from the excellent Lucy Higgins at IndiBike: https://www.indibike.co.uk/
The delay's been my fault not hers. 3 sets made, also with @GrahamJohnWallace's Metro Trekker part.
View attachment 886288
View attachment 886289
Also, red cable outers have arrived. I suspect the originals would have been fat 6mm brake and 5mm gear, but I've gone for no-logo 5mm brake all round since it's Teflon lined and will operate so much better.
View attachment 886290
On to the repair
All the best,
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The English Cycles Metro-Trekker was produced for a short period in 1985 whilst the Muddy Fox courier sales took off in a big way the following year.
So I was wrong when I presumed, earlier in this thread, that the Metro-Trekker was Jeremy's 'response to the phenomenal sales of the Muddy Fox Courier'. And the fact that both of these city-bikes were white is just a coincidence.
