Flip the Trygg up side down and clean the bottom side with acetone. Apply UV-curing glue along the rim of the bottom. Remove the sticker from Blanda and clean it with acetone. Place it on Trygg and let the glue cure using a UV-light or by placing it in direct Sunlight.
I used Casco Express Glas Ultraviolet curing glass glue as it is dishwasher proof and completely clear.