Molynoox
Established Member
The 1.2mm is likely the thickness of the metal on the hook. The hook needs to move so the tape is correct on both push and pull. If you glue it then it will only ever be accurate on push OR pull and not both, depending on which of the two positions you glued it inI measured several from the inside face of the hook to the 100 mm mark with a rule and and there is nearly always a 1.2 mm difference so with the hook glued in place 100 mm on the tape is 100mm on the ruler. I get it if your pushing the hook against a surface and measuring that it makes no difference but if your start point is the edge of a board then you naturally pull against the hook and it’s loose then it’s no longer accurate imo of course. I prefer a steel rule for accuracy then there is less room for error.
Martin