Posted By Peter Glus
I have a C14 and the only thing that works is the Lumicon Giant Focal Reducer. This comes as a stand-alone and as the Giant Easy Guider (the only difference is that the guider has the side tube and prism). This provides two choices of reduction (via a moveable lens element).
Problem is -- these are only available on the used market, so you have to pick one up here. If you post a wanted ad, you could probably pick one up for 150 or so.