How to Troubleshoot & Replace Whirlpool AP3121800 / 84867 Solenoid Wig Wag

Using a wood push stick I manually engaged the "plunger shoe" on the spin cam bar to verify the spin mechanism/transmission would still engage and function. Verified voltage (120V) was present at solenoid, therefore, the spin side solenoid must be defective. Replaced "Soleniod Wig Wag" assembly. Notes: Need to remove setscrew completely since it is really a pin that goes through entire shaft. Cleanup shaft and remove any burrs on shaft and Wig Wag hole with emery cloth. Apply a small amount of grease to facilitate assembly. Since space was tight so I used a ratcheting bar clamp to draw/press wig wag onto shaft. My go to local appliance part store said part has not been mfg for 7 years. Nobody makes parts for machines older than 25 yrs. This machine is 32 years old. If any are available it will be whatever is left on someone's shelf. He call mfg and they said they still had 7 available. Placed order but after a week mfg said inventory was wrong, no parts in stock. But AppliancePartPro had the part. Received part and it appears to be OEM replacement part, not a secondary market build. No I know where all the Whirlpool factory parts disappeared to. 

Ordered Wave Solinoid Assy, installed same and works very well.