Try the Air Clamp at peweights.com
You can read some reviews about the product in the Review Section.
When I start clamping again (after my length goal is met), I’m definitely going to incorporate the Air Clamp into my girth routine.
Any plans for your solely girth routine? :) Sorry, trying to research, as it’s all I want right now, so I might as well follow the examples of other, more experienced “members”! HAH! HAH HAH! Get it? JOKE!