Mainspring Barrel Cap Press, Watch Repair Tool

thingiverse

Here's how to use it: Once you've managed to rewind your mainspring into its barrel, simply place the cap on top of the barrel. Next, put the barrel and cap together on the base and use the top to firmly press the cap into position. Notes: Let me know if this works for you. I'll be happy to update or customize it as requested. Also, for larger mainspring barrels, you should be able to scale it up easily.