S Hernandezwrote a review of Blackburn Mammoth 2Stage AnyValve Mini-Pump on August 11, 2019
Familiarity: I've used it several times
Just like the prior reviewer stated, its hard to stabilize the pump head while pumping. The other problem is the high volume switch broke after a dozen uses. It doesn't pump any air in the high volume position. Ergo, I'm only able to pump my mountain bike tire up halfway before the pump stops working. Not in high volume or pressure. Zero star rating.