Hi
Finally managed to get hold of one of these - absolutely brilliant piece of kit, totally transformed my table saw.
Locks rigidly - really rigidly - you couldn't move it if you tried, adjustable so you can get it dead parrallel to the blade and has a really nice magnified window for the measuring scale.
Only one problem I had installing it was getting the self adhesive measuring strip in the right place, not mentioned in the instructions, but easy enough to figure out.
Very well made, heavy construction, £50 well spent.
Highly reccommended. Usual disclaimer I have nothing o do with Axminster Poweer Tools.
Dave