Ammeter to Voltmeter...who does it?

I didn't cut the needle. I decided I would paint it.

I will look harder but I did see a disc or something like that trim pot on the back where you show it but it does not have the typical Phillips head slot. There is a dab of clear blue glue or something on one side of it...maybe locks it from turning?

I show the counter weight that I had to cut in that second picture.
Just used a nail clipper and chopped about 1/8" off that hung below the coil.