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Swingarm Clamps developed by Heinz Kegler.  The early bikes only had a single bolt in the swingarm tube to fix the swingarm axle in place inside the cradle tube. It doesn't take a long amount of riding before the swingarm axle wallows out the tube ends in the cradle and a noticeable amount of lateral play develops in the swingarm. It's very noticeable when you ride an early bike with a worn swingarm tube. Before I fixed mine I described my bike as riding like a snake. It was that bad. Back in the 80's I actually thought it was the swingarm bushings and I took out good ones and put new ones in as an attempt to fix the problem. Back then I didn't know any better, and just rode around on a bike that snaked down the road. I always wondered why everyone thought the commandos handled so well because mine did not!

You can make your own. (I did) or you can buy them from NYC norton already made and just install them.  The clamps look like this installed.