Firstly, fake shafts are used alone. Not with the sled or tire dragging behind her at this point. She is just learning how stiff shafts feel again. You do not want other stuff like traces that pony could get tangled in if she does act silly. You need to long line her with the fake shafts in both directions, also going straight, so she feels the pressure on both sides, maybe leg touches, walking, trots both slow and extended. Again, alternate in the open and blinker bridle over several days work. See how she responds. She may need more time doing this to settle with shaft feel on her body.
We attach the shafts with light string and a snap, easy on, easy off. If she should act up string breaks, drops the shaft. Should string break you halt her, put the shaft back on and walk her off again. NO BIG DEAL. You donât get excited, just have her stop, stand, fix the shaft on again to continue work. You want pony being obedient, stop when asked, accepting of unexpected things that will happen when driving.