You can cut through a alloy or carbon frame in a few seconds with a hacksaw not that much longer for a steel frame .. or take off 80% of the value with a couple of Allen keys… and perhaps T25..
I’ll admit that this had been going through my mind. Especially given that a frame is probably the most easily spotted / traced bit of a (decent) bike, modern forks, drivetrains and wheels are pretty valuable. At what point does a scrote simply cut the frame and make off with a slightly less valuable haul rather than trying to get through a D-Lock?
Given what a pain underseal is when using an angle grinder – it tends to lubricate the disc and stop it digging in; has anyone thought of wrapping a D-lock shackle in that landlord special stick-on flashing that’s a relatively thin foil with a thick, sticky tar layer? Possibly then going over it all with self-amalgamating tape. I’m sure it could be picked off, but if it’s enough of a pain to stop a quick theft, it might be worth considering.