Some years ago, one of my colleagues decided to get back into cycling and dug up his old BSO. It wasn't a very stable ride, and when I looked at it, it had an old mechanical speedo, with a pickup fitted between the hub and fork. In essence the wheel was slightly sideways from where it should have been, so the front and rear wheel tracks weren't in line.
Once we binned the speedo, the bike worked OK, well better anyway, it was still a heavy old BSO!
Admittedly, it wasn't strictly speaking a bodge, but it was a damned bad idea by whoever did it!