For Click (nogoger), one way you can handle the F is to add an extra dozer slowly making it's way down to generate an F, which would always arrive behind the other dozer for any other value.
Wait, I solved Vault before? And yes, the solution is easily fixable, replacing the ramp next to the down pipe with a girder. If you look at my solution for Spinning Wheel you will see it uses a dozer though as I didn't read the intro before solving it.