Wanted - Counterweight(s)

Hi all,
Fairly recently acquired an EQ6 and then a C11 to put on top of it. EQ6 came with a couple of 5kg counterweights and I already had a 4.5kg and two 2.5kg weights, so assumed this would be enough. For viewing and basic imaging it is, (just), but when I stick an autoguide scope on the back of the C11 I'll need more counterweight.
Ideally I want something around 10kgs - perhaps two of. 25mm hole I think. If you have anything kicking around you're not using then please let me know. Local to the south would be good too, as postage could be a bit astronomical! ;)
Thanks,
Tim.
Fairly recently acquired an EQ6 and then a C11 to put on top of it. EQ6 came with a couple of 5kg counterweights and I already had a 4.5kg and two 2.5kg weights, so assumed this would be enough. For viewing and basic imaging it is, (just), but when I stick an autoguide scope on the back of the C11 I'll need more counterweight.
Ideally I want something around 10kgs - perhaps two of. 25mm hole I think. If you have anything kicking around you're not using then please let me know. Local to the south would be good too, as postage could be a bit astronomical! ;)
Thanks,
Tim.