I have a JoeBlow Sport (not a Sport II or Sport III)
It head defaults to schrader style. There was an adaptor in the box which I thought was a presta adaptor.
I tried sticking that adaptor in the pump small side (screw side) toward the pump, other on the tire presta value. No matter what I tried I could not get the tire to take air (yes, I unscrewed the lock on the presta valve)
I looked for some videos and the manual but I can find nothing on the JoeBlow Sport. Only the Sport II and Sport III which have a different head.
I found this video about some other head and how to change it. It involved opening the head and flipping parts. So I opened the head on my JoeBlow Sport but I can't see any way the parts fit differently.
If I flip the second part from the right end, it's black and rubber, it looks like I'd expect for a presta valve but it's impossible to close the head back up with it upside down. In fact I can't see any point in being able to open this head, flipping any piece whatsoever makes it impossible to close.
Can someone explain what I'm supposed to do here?