One click butter slicer improvements (cap/spring)

I do not like to destroy my toasts spreading butter so the one-click butter slicer is perfect, but not completely flawless.

Print instructions

These improvements are designed for:
https://www.amazon.com/Inventions-Market-Butter-Cutter-Stainless/dp/B000Q9YXXK
https://www.ebay.com/itm/Butter-Cheese-Cutter-Slices-One-Click-Squeeze-Serves-Stores-Kitchen-Slicer-Tool/302498292235?epid=714028590&hash=item466e4da20b:g:qmQAAOSwI59Z7b3l

The original rubber cap falls easily and it is impossible to use. This new cap fits very snugly.

Also, the spring on my unit is not strong enough, so I added a spring extender that helps the spring.