I use a combination of locks depending on the machine.
One useful weapon is the Masterlock Street Cuff
THe cuff is just the right size for a 50 mm tube, and the options are up to you.
Putting a trike with a post in the crux of the triange, put one cuff on the crosspiece and one on the boom and it will be secure. Alternatively, one on the boom and on to a post will also function.
One useful weapon is the Masterlock Street Cuff

THe cuff is just the right size for a 50 mm tube, and the options are up to you.
Putting a trike with a post in the crux of the triange, put one cuff on the crosspiece and one on the boom and it will be secure. Alternatively, one on the boom and on to a post will also function.