How to use "multi" in a sentence

The first plan is to use the large knife on the multi-tool to chip at the boulder

I could amputate my arm using the multi-tool

I take the multi-tool from my climbing bag

I lay the multi-tool on the boulder and reach for the water bottle

I don't want to break the knife, so I use a different part of the multi-tool

Then I pick up the multi-tool, open the shorter knife and push it hard into my arm