I'm going to take a wild stab at this and say I missed the memo (I started in Oct.) that connecting two regular rope drums at opposing ends of an object to pull and push is not quite right yet. Oh, I got the locking drums to work wonderfully to pull a set of carts on tracks back and forth, but only at very short distances. I sat and watched an hour of videos (some dating back to 2015) where some enterprising individuals attempted a push/pull system for objects such as carts and farming constructs - all met the same fate. Severe stress when attempting to pull back an object with rope drums at either end. Same fate I met. Made a power transmission with wheels and ropes that worked fine. So did they. Got my cart train to move in one long distance direction just fine. Same as the videos. Reverse the crank and tension builds to the point of BOOM! Yes yes, I know we are still in development n all so, no biggie. Only thing I might ask is if it's possible make a setting for locking drums to be longer or better yet.....unlimited in length (or at least a length allowance based on just how much rope you can carry in inventory). Not complaining folks, just trying to grow beyond the 'just building pretty houses' stage of the game.