Ron brought in an ancient mahogany Favilla Baritone that he found on the internet. The original tuners were slipping making it impossible to keep in tune. I had just bought some of the new Gotah UPT tuners.
It was easy to remove the old friction tuners.
. Here are the Gotah's. The one on the right is dis-assembled. The top piece threads down onto the bottom piece clamping it to the peg head. They have internal gears giving them a 4 to 1 gear ratio.
I had to drill much larger holes through the old peg head. This larger hole makes the Gotah an easy replacement. Old ukes Friction tuners usually had pretty small holes.
The tuners have a tiny sharp point protruding from the gear box to prevent the tuner from turning. You mark the place where the point is to be and punch a hole for it with a thin awl. see that tiny point on the right hand photo?
Once the hole is drilled they are very easy to install. They turn very smoothly and hold their position firmly. No slippage noted. I think they will be excellent to upgrade old ukes.
You adjust their tension with a very small phillips head bolt on the back of the thumb knob.