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Thanks for the advice Geoff, this one's got me beat though so I'm giving up before I wreck it. This particular grub screw is down inside a hole making it extra difficult to work on. The focuser holds a dslr and reducer now that there's a bit of tension on the drawtube.
Here's a photo of the pinion block removed from the focuser. You can see how the brake works, clamping onto the sides of the rack.
The pinion to rack mesh is set using the 8 push/pull screws.
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