I added an Astro-Physics back to the RCX for a couple of reasons. First, because
once you use a brass compression ring accessory; you can never go back! Second,
check the next image to see the difference in the openings.
Back Part #: ADASCTLM
The Asto-physics back provides a full 2" unobstructed opening. I also bought a 1.75"
extension tube (not pictured) to give approximately the same back focus (+.25")
as the stock cell/visual back.
Extension Part #: ADA202
When I was unpacking my tripod the first time, I noticed that one of the pins had
fallen out. It was in the bag that the leg was packaged in but I decided to replace
them at that point. I went to the nearby Ace Hardware and got some 3/16" brass bar
stock and some cotter pins. I cut the bar to the correct length and drilled tiny
holes at the end for the cotter pins.
Close-up of the final pin assembly.
It's nothing too fancy but they won't be falling out any time soon.