i was thinking mm thanks
Those shim thicknesses will be inches: 5 or 10 thousandths of a millimetre would only be 2 to 4 ten-thousandths of an inch, which is impossibly thin for a shim that is to be fitted in the field.
Loctite is a good material so long as you don't rely on it. Also, it only works when both male and female threads are surgically clean. Any trace of oiliness keeps loctite from working. Petrol is not an adequate degreaser, you need wash with MEK or something similar to get a reliable result. In other words, my concern would be that the machine would be back in service by the time you got the washer, and as a result it would never be fitted, possibly resulting in an unreliable mower.
