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One thing I found that I needed to measure the size of my lense because it was smaller than in the video. Drill bit and lense were the same size, had to woller the hole to make it fit. Then I got the hole too big... A little super glue on a toothpick wiped on the inside of the hole and allowed to dry and you are back in business. The lense can be inserted without falling through. Do not get the glue on the lense or plexi, and do not use acetone on plexiglass as it will mark the surface.