Needlewheel to Meshwheel skimmer mod

[Jaws]

Hey guys. Is the venturi mod only recommended for recirculating skimmers or would this improve on any pump that had the meshwheel mod?

Are you using this mod instead of pushing air with an air pump?

Where's the best place to buy the black screw fitting and the venturi nipple from?

Is the PVC in that picture just to show you how the mod works or do you attach that to the pump intake somehow? (probably a stupid question but just want to make sure)

Also I didn't see an answer from anyone if you think a dremel could be used to cut the needles of the needle wheel or if a blade would work better.

Sorry for all the questions. Thanks.