I have not, yet, but I am interested. I also like the silver fine focus knob better than the gold. I have a fc-100dz and assume I would need this one: https://starlightins...&product_id=124
How difficult is it to put one on?
I think you'll need the 2.5 MPA for your DZ. I originally purchased the 2.7 MPA for my DF but found it to be too large. The 2.7 was very difficult to get leveled & centered, and there was some sagging in the front once I got it assembled.
The 2.5 MPA was much easier to install, and it fit perfectly. It is a bit of a learning curve to assemble, but it's not too difficult. The hardest part was getting it level so the pinion would be in line with the rack. If it's not level, you will get a 'cork-screw' motion from the focuser tube.
Here are a couple photos of the 2.7 MPA installed on my DF. You can see how it was sagging and a bit too large.
Edited by rkelley8493, 22 November 2020 - 03:23 PM.