Attaching the seat post clamp

Step 3: Attaching the seat post clamp

This is the most important step and must be done with some care. I have used several methods of centering but the best relied on fitting the clamp on the ocular and then adjusting the position of the glued case with the iphone in position until a perfectly centered video image was obtained and then either hot gluing the seat post clamp to it temporarily or marking it very carefully to be certain of its permanent positioning. You want the quick release in the upper unobstructed position on the set-up. Although some other variation may serve you better. The other thing to take into consideration is part of the clamp has to be mobile to afford the quick release lever function. You can see from the photos the way I have done mine. To hold it in position I also drilled a hole through the clamp and screwed it with a safety screw to make sure there would be no problem if the glue failed. This would result in a $600 disaster--and you are warned to be careful with your construction and use it at your own risk. I hate disclaimers on these DIY projects but it is fairly obvious that if the parts fail you iphone 4 will be toast. We have used several variations on this holder over many months and feel safe there is no risk if made well. If you feel nervous you could put a safety tether line from a small suction cup on the iphone glass around the ocular. The safety screw as well as the section of the clamp that is to be immobile is glued with epoxy--I use J/B bond for this.