The Hammerhead/Stall Turn in Glider Aerobatics 

George White I would like to make more instructional videos, though this is very time consuming which is limited for me at the moment. I can advice you to read the handbook of glider aerobatics, this is a very useful book. Other than that, I've gathered a lot of glider aerobatic videos on my channel. It's useful to see how others fly, with very different styles.

yes, in a glider you really need to side slip to the right for a hammerhead to the right.

I mean the rudder. for the right turn hammerhead shouldn't I kick the rudder to the right?

Ah got you know. Yes you kick the rudder to the right eventually, but the part you refer to is about setting up the aircraft for the actual turn.

Ace Han you preload your turn with left rudder and then flick it to the right

That's right, see it in action here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-WG4ifXUSPFk.html

Only the best are able to actually fly it at 0 AOA, so control yourself, stop using those words! ;)