Many, if not all of use have had a broken speedo cable loop. There are a couple available in the aftermaket (newspeedmaster for one) but some have made their own.
I used an eye bolt cut off to length. I then used a rubber sealing washer to protect the fender and a thin nut on the back to hold it in place. It now resides on Mark's bike.
Another cheap fix is to cut the original loop part off so that only the tall stub remains. Then drill a small hole in it and insert a black zip-tie through the hole, around the speedo cable and cut the zip tie off with some side cutters.
Speedo loop fix - overlap two broken rubber ends - ziptie. It has held for 6000 miles so far.......
