[Davew]

Then I have a Gaz brush! I find it pretty good for first cleans but it seems to lose it's shape a little, still a little heavy for my girly wrists!

[macmac]

Yes the green brush is a salmon (gaz) brush.

Yes, the hole must be drilled from top to bottom still allowing the swivel action.
I found a brass nail that just fitted perfect in the hole, it's made a terrific difference to the rigidity of the whole thing, can even push up top sashes closed with it now.

tony