>>105562102
cassette wrench needs to be slimmer so it fits between the gears, so a regular wrench usually won't fit.

Here's another great tool I got a while ago. It's a little brush to clean out the draining at the back of the inside of your fridge.
If you get water pooling at the bottom of your fridge this hole is likely clogged.
While you're at it it's a good idea to also dust the evaporator coils behind your fridge to make it run more efficiently.