There are 1.5v AA Lithium cells
There are 1.5v AA Rechargeable Lithium cells
There are 3.7v AA Lithium cells and
There are 3.7v AA Rechargeable Lithium cells
AA doesn't always mean 1.5v and Lithium doesn't always mean 3.7V
The anchor looks like a slip fit auto adjusting type. Pulling the pendulum high and letting it go should result in an even beat. The friction clutch attached to the pendulum hanger and anchor arbour has very little friction at the range of auto beat. It's fine the rest of the way around. I...
You can buy these dowels in packs from the hardware store. Measure the square end of the broach and drill a hole in the end of the dowel one number size less than the square size. Grip the broach with some pliers up by the square end and push home. The dowels are slightly fluted and grip well.
I used 1mm Aluminium sheet. I sketched up the handle using these dimensions. They seemed to work ok. When you used the tool did you slide it between the escape wheel and the plate or on the inside and view through peep holes?