Okay, after reading about using ABS glue to attach the extender instead of screws I thought "Why not?". So down to the hardware store, small can of black abs glue and back to the garage. Clean the fender and extender, wipe down both parts with rubbing alcohol, lay on a healthy portion of glue to the extender, grab hold of the parts for about 3-4 minutes and laid it aside. Change the oil, filter & final drive lube (600 mile), come back to the fender and it's already feeling solid. Reinstall the fender and now some 24 hours later I am ready to get off this computer and road test the job.