What is thesize of the hex allen wrench or socket that would be used to loosen the transmission dip stick?

How do you guys bleed air with the Harley air pump?After I have pumped in the correct amount of air I have noticed that if I push the button beside the air guage, nothing bleeds out. The button seems to do nothing. What is the buttons purpose on the pump? To bleed air out I would have to get something to push on the pin inside the valve.

 

Not sure of the allen size, but for the bleed question. To bleed the air out of the airshocks, you need to pump a little air into the shock first. Being careful not to exceed the psi. then after you remove the pump from the nozzle release air by pushing in on the needle. Just like you would on a bicycle tire

 

push the button in very slowly and about halfway in it will let small amounts of air out.

 

I believe it is a 3/8 allen

 

..3/8"
Later

 

HD calls it a "micro bleed" valve. Mine lets out a tiny bit of air each time I press the button. You have to press it many times to see the needle move, you can't just press and hold it down to bleed the air. It allows very precise deflation although I don't know how accurate the guage is.