How does the Ohto Piston work?

Name: How "uni Return's" return the lead refill
Uploaded: 2024-08-28T14:38:45Z
Description: Found this today: The Uni Return’s seems to function like the Ohto Piston [image] [How "uni Return's" return the lead refill] https://jp.mercari.com/en/item/m32899334759