tennis trainer/ speedball ball hook
thingiverse
a simple hook to attach a standard size tennis ball to a cord (could also be bungee). 1. put a piece of strong nylon cord or bungee cord through the hole and make a double knot at the flat side of the "hook" (maybe add some CA glue) 2. drill a 8/10mm hole in a tennis ball (uses a smaller drill first) 3. push the knot on the cord through the hole followed by the "hook" part
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