E-Unit renovation is complete, and works perfectly. It is satisfying to see that plunger move and engage the drum! Yesterday morning E-Units were a complete mystery to me. Now, having dismantled and repaired one, they are familiar acquaintances, but not friends.
The sadistic engineer who designed them made it impossible to love an E-Unit. Requiring the repairer to keep the 4 finger contact, the drum, and the 2 finger contact perfectly aligned with their seating holes before clamping the unit closed is an unnecessary cruelty. It consumed the better part of an hour before I got lucky.
If that engineer were a kinder person, we would have had guide pegs or simple sleeves to slide into place both the 4 finger and 2 finger contacts and springed axis for the drum. If, if, if...If frogs had wings they'd fly like the birdies.