GE Profile Top Load Washer will not agitate

Washer Repair
1

Brand:GE
Model Number:PTW700BST0WS
Main Symptom:no agitation
What happens & when:clothes not getting clean

Error Code (if any):
Parts or tests already tried: Lid lock mechanism has been replaced. Did not fix issue. Machine passes the spin/lid lock test. Machine will spin and drain but not agitate.
Photos / video link:

2

Hey Mike, being that it will spin and not agitate, that points to the shift actuator being my number one suspect. The actuator does exactly what it says it does: it shifts the gearcase from spin to agitate. WH03X31937 Mode Shifter | Genuine Ge OEM In Stock

3

Understood.

One last question before I get that part…

I removed the wash plate to see if the splines were stripped. They appear to be in good shape (although the rubber washer underneath is totally disintegrated)

I noticed when I put the wash plate back on the shaft 2/3 of the way and turn it, the splines catch the shaft and I can rotate the entire drum.

But when I drop the wash plate ALL the way onto the shaft the splines no longer catch and the wash plate spins freely with no drum movement.

Could this be a wash plate issue? How can the splines catch when I lift the wash plate about an inch but not catch when it is lowered back down into its proper position?