Topeak Pocket Rocket Master Blaster
 

I recently bought this mini pump and can't figure out how to convert it to schrader valve. It's not the usual flip something around and directions are in several languages but none in English! I hope someone can help

Unscrew the head. Remove the rubber gasket and guts (plastic piece). Flip the plastic piece over so the pointy part is facing out the hole and reinsert. Flip the rubber gasket over and reinsert. Screw on the head. Done.

See this if you still don't understand.