The functions on the SwissTool can be opened from the outside and the functions got independent springs to avoid clumping.
The locking mechanism
is a metal plate operated by a spring with the release button on both sides.
It is normal to find some play in the lock.
It is smart to
sharpen the blades from time to time and remember that a sharp knife is a safe knife.
From time to time I give a stripe of oil
across the functions and move them into closed and locked mode. The stripe of oil will then get into the friction parts and this will secure the best functionality.
If much dirt and substances develop
in the locking mechanism then I use warm soapy water and a plastic brush. I clean everything inside and clean every function independently. I like the mechanism to move free and this secures the functionality. After soapy water I rinse much and move the functions.
After this I give the tool some oil.