build a $4 lens with interchangeable kaleidoscopic filters for any digital camera

Step 4 Make it interchangeable

before gluing anything, i inserted a lens into the blue tube, shoved the white one in after it, and then started drilling. i drilled a hole through both pieces of plastic to accommodate a small screw. this allowed me to change the lenses for various effects.

i'm sure there is a better way to do this and welcome any ideas.