mart
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First, the one suggested by Bladevane is the easiest. Off the shelf and exactly what you need.
G and s (upper- and lower-case respectively) are standard terms in ISO limits and fits, and so refer to the hole size the bush fits in and the shaft size which passes through it. The letter itself, the case it is in and the number all mean something. The other place you will commonly see it is on a thread cutting tap or on a reamer.
See:
http://www.pfeffer.ch/isotolerances.htm
I`ve registered on this site. I can see the item . As you say, it is exactly what I want. I have been trying ages to put a couple of these in the basket, but there is no option to do so???? What could be wrong?