I don't know anything about the sizes of anything on a WD Matchless and I didn't even think about the sizes quoted...
My post was only to help (I hope) clear up the apparent confusion about how to express the measurements and to point out the thinking behind and purpose of tolerances ....Ian
:laughing: :laughing:I see what you did there Jan ...The Metric system is efficient but dull...Whereas the wonderful Imperial measuring system (developed from the Winchester System of 1588), whether weights, volumes or measurements is so much more entertaining...Ian