Traveler
Member
I seldom get to contribute anything, and this may have been done to death, or look all wet, but here goes:
I had trouble getting the sheave aligned on my vintage Whizzer. It always had a slight wobble. After thinking about it for a few days, I came up with a simple jig that aligns the sheave from the rear axle. It is simply a piece of wood with a hole drilled in the center to fit the axle. I have it sitting on a workmate bench and resting on another drilled piece of wood. The screws are loosened from the sheave.
The clamp holds a smaller piece of wood barely touching the inside of the sheave. I slowly rotate the wheel. When the sheave rubs the wood piece with a lot of drag, I use a mallet and tap the sheve in that location from the inside. When the sheave shows space from the piece of wood, I tap it from the outside. When alignment gets real close, I slightly snug up a couple screws and repat, making fine adjustments and tightening screws until the wheel rotates with the sheave just touching the piece of wood as the wheel spins. I tightened all the screws and the sheave is lined up nicely. This will also align a slight out of round sheave.
The only tools required are a drill, small saw, and a clamp.
Photo attached.
I had trouble getting the sheave aligned on my vintage Whizzer. It always had a slight wobble. After thinking about it for a few days, I came up with a simple jig that aligns the sheave from the rear axle. It is simply a piece of wood with a hole drilled in the center to fit the axle. I have it sitting on a workmate bench and resting on another drilled piece of wood. The screws are loosened from the sheave.
The clamp holds a smaller piece of wood barely touching the inside of the sheave. I slowly rotate the wheel. When the sheave rubs the wood piece with a lot of drag, I use a mallet and tap the sheve in that location from the inside. When the sheave shows space from the piece of wood, I tap it from the outside. When alignment gets real close, I slightly snug up a couple screws and repat, making fine adjustments and tightening screws until the wheel rotates with the sheave just touching the piece of wood as the wheel spins. I tightened all the screws and the sheave is lined up nicely. This will also align a slight out of round sheave.
The only tools required are a drill, small saw, and a clamp.
Photo attached.