Man, you were so fast today! I have 12 incher (brand new) with coax/power cable laying around. You could make a good deal.
2nd - I do not see need for such counterweight. Counterweight is needed to help motor (actuator) to move antenna from most-East(West) position. In your case, it will not work. Instead of counterweight IMHO it is better to use weight of antenna itself, you just need to lower it's center of gravity.
View attachment 67434
Guess I was a bit fast ..but sadly ..that's always been a problem with me ..impetuous..
Sometimes an advantage as it gets me motivated ..but not always a good thing.
;)
The reason I was considering the counter was to help ease the tension on the elevation jack ...but I guess it would only have any real advantage at the top of the arc..
If you think it pointless then I'll shelve that idea..
moving the centre of gravity wouldn't be easy ..though my exoskeleton adaption does a good job of tranferring the lnb bracket weight backwards to the motor and mount ring..
I'm attaching a full photo of my creation in profile so you get a better idea of the current state of play.
Whatever else it may be ..I'm very proud of what I've done so far ..
imo ..'tis a thing of beauty.
rgds
VS