The other interchangeable mount is quad 18mm. Although the spacers and vanes were available, the specialized rings were not. The fwd ring is just a 115-225 interchangeable. So I picked up a set of those, and a 115-175 for the mid ring to attempt to cover the tubes and provide the notches needed by the other spacers. The aft ring that centers the four 18mm tubes still needs to be completed. This mount will use a threaded wood insert betwwen the tubes so a bolt can be used for retention. The 115-175 does not extend past the edges of the tubes so I have some other options on the way.

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