For all the engineers in this group. I have a question and observation for you to figure out…that is if you want to. I’m building the Windmill Pump from an early 50s 6 1/2 Erector manual for my 4 year old granddaughter because she loves them, but calls them “spinners”. Not a difficult model, right? Not quite. Take a look at the pump part of the model. I don’t see how that could possibly move.

First photo represent the “only” illustration showing construction of the model.

Second photo is a close-up of the power unit and pump.

• Note 1: If you install the CJ 36 tooth gear here, it won’t have the correct gear ratio as illustrated in the recommended Electric Engine No. 9. (Photo 3)
• Note 2: This completely stops any rotation.
• Note 3: There’s not enough vertical slot for the drive arm to move up and down vertically to simulate a pump.
• Note 4: This appears to not be anchored anywhere so it would flop all over the place, if there was any rotation.

If anyone has insight into this, I would greatly appreciate it.