Modified Eyepiece Holder

I printed the original iPhone 5 Eyepiece Mount (http://www.thingiverse.com/thing:39308) and found that the eyepiece holder only fit one of my eyepieces thus limiting my selection. I decided to modify it by splitting it to allow it to expand or contract a small amount to accomodate some of the other eypieces I wanted to use. There is a hole for a screw, or you could use a rubberband or plastic clamp as shown which works well. After trying it a few times I found that it gave better results when