Air Strike Series 

I have the 850 same issue and it just deflates the tires…

Yes, trying to switch from schraeder to presta is crazy. How do you switch them?

Has anyone figured this bullshit out??

See my response to Vinicius, hopefully 850 is similar to 950.

You have to really work the rubber part out and it's underneath. Now, if only I could get the pump to attach to my tires. What a piece of crap.

See my updated instructions to Vinicius.

Update: After watching a RJ bike guy video, the following seems to work. Ensure you have the correct schrader or presta mode on pump (schrader has bigger diameter opening on pump, see below if hole doesn't match your valve). Flip lever up away from pump shaft, press pump opening onto valve as far as it goes, you may have to support tube from other side to fully engage pump. Lower lever toward shaft of pump, which locks pump to valve. If you hear air leaking out, valve was not fully inserted into pump. To change to presta, unscrew cover, rubber bushing, and plastic piece. One end of plastic piece is for schrader, the other presta. The rubber bushing has different size holes on each end so match the hole with the diameter of the plastic piece. Re-install pieces.

You’re kidding right?

@@eddieeaves4390 nope. My older brother tried to open the handle but it didn’t go through. He told me that it’s hard to open it. 🤔

@@raineforte6271 The handle snaps into the body of the pump, and is hinged in the middle. Unsnap the handle, fold it open, and there you have a pump.

I had the same problem and didn't want to force it because it is made of plastic. I finally put a little more force than I was initially comfortable putting and the handle flipped open. Pushing down on the end before flipping the handle may help.

@@hardianekadjaja670 understandable... I’m really unhappy with after two of these the gauge does not work. At all.

Just got the 580 and it’s a scam it does not work on presta valves!