I just started using presta valves (new bike), and I got one of the brass presta>schrader adapters to screw onto the presta stems so I can keep using my schrader floor pump.
Problem: For the life of me I can't get the adapter to screw onto the presta valve stems. All my searches just said "...and you screw the adapter on..."
So what gives?
I've tried it with the presta valve screwed all the way open and halfway open. I've made sure the presta seal wasn't stuck (although that hasn't even been an issue yet since I can't get the adapter installed).
I've tried screwing the adapter on upside down, and it screws on just fine then, but that presents the wide end of the adapter to the pump so it doesn't fit.
I'm sure there's something totally obvious I'm missing, and yes I have opposable thumbs.