For this one, essentially you place and cut a guide using Tesa 61395 to make your own adhesive. Having just pulled apart another broken Pebble for parts, my guess is that the adhesive is perhaps 1mm thick, but then compressed down for a quality bond.

It's worth noting if you go down this route, take the time to acquire genuine Tesa Tape (61395) - the knock-offs are nowhere near as good, and Pre-Cut Adhesive also doesn't really hold up the same way either. In essence, nothing else compares!