I have no idea if this idea is original, however it worked perfectly in my situation.
My TEC-180 fits in my observatory "only" if it is mounted very close to the middle point of the camera end and end of the dew shield. My camera gear is quite robust so I needed to add weight near the objective. My solution was to use ankle/wrist weights which come in pairs with velcrow attach points. Putting two together in series and then making use of the elastic material the two weights just fit around the OTA. I secured them with several joined tie wraps. It took 4 weights to balance however, the nice thing about this system is you can slide them along the tube to just about any point and you are done. Too easy!
These weights are all over ebay and Amazon. Here is an example:
https://www.amazon.com.au/Holyfire-A..._1_11?crid=ZBQ
Peter