I have just used duct tape to save myself a few dollars. I neede a focus gear for my Canon 100mm non IS. They are available online, but due to our weak currency and high shipping costs I needed to look for alternatives. I have sent the dimensions to a friend to design and print a gear for me, but that will take too long and I have a trip planned. I do have a zoom gear for a Canon 10-20 but the tube is too short. After a real "lightbulb" moment I decided to try the gear I have and stick it to the lens with ducttape, and voila! A working solution!
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