Test fit the tyre to make sure it is tight on the lens.

Clean the lens groove. I used Isopropyl alcohol for this.

Wrap double sided adhesive tape tightly around the intended location of the tyre with an overlap.

Clean the inside of the tyre and fit over the tape using a progressive lift and slide motion to avoid dislodging the adhesive tape.

You may find a small screwdriver or similar lever helps to position the belt.

Once fitted, press the tyre firmly into the tape to secure the bond.