Recommended Size for Shaft :
13.5mm Bushing for 7mm to 8.5mm Shaft
14.5mm Bushing for 9mm to 9.5mm Shaft
15.5mm Bushing for 10mm to 10.5mm Shaft
16.5mm Bushing for 11mm to 11.5mm Shaft
17mm Bushing for 12mm Shaft
Using different size will gave different feels when the bushing hits the Base bottom hole (restrictor).
Choose the weight:
- Plastic Bushing made from POM. Light weight, barely put additional weight, good for dynamic movement. Plastic material is maintenance free.
- Metal Bushing made from Brass. Weight is heavy and helps to counterbalance the handle. Good to build repetitive movement rhythm.
Bushing needed to install bearing actuator.
Ring is not required for "GL Shaft"
you can learn more from this article.
Because it puts the point of contact lower than generic actuator, you will need to compensate using slightly bigger actuator compare to generic actuator.
Golden and Silver Bushing will make metal to metal contact to the spring, better if you put some lube on the contact area to reduce friction when the shaft spins.