Worth bringing up: If you’re trying to replicate the PhalBack system, the vibration is the part you need to add hardware for. But the "15 seconds of vacuum followed by 5 seconds of repressurizing, repeat for 15 minutes" part IS replicable with a conventional pump.
There’s value is splitting out the experiment of "what, if anything, does the vibration add" from "what, if anything, does the pressure cycling add" from "is there a combined effect of both"? But I’m feeling like people jumped on the vibration being the part that a normal pump would need mods to replicate, and jumped right past the pressure cycling.