Umbrella Holder Spacer
thingiverse
My new umbrella has a slender handle, and my new umbrella holder for my bicycle has a big cylindrical slot to hold the handle. So the screw-in, spring-loaded thingie that holds the umbrella handle tight can't tighten enough to hold it. Hence this simple design that sits in the cylinder and effectively makes it smaller. Instructions Printed it at 10% infill.
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