So i finally thought id fixed the problem with my heli spinning in circles by glueing the pully wheel to the rear rotor shaft.
now i can stop the heli spinning until it lifts off that is
Heres what ive noticed : when everything is switched on apart from the motor when i push the left stick left and right the rear rotor blades move accordingly but as soon as i push forward on the stcik the blades move completely to one side if i reverse the gyro then they move completly to the other side. Am i correct in think that the gyro thinks im accelerating the blades and compensates for the torque of the main blades by sending a signal to the rears to move further? ive tried moving the gain up and down and doesnt make any difference.
also when i push forward the sevo for the blade pith clicks and gets faster as a move further forward on the stick and sometimes keeps clicking (almost sounds like a motor spinning) even when ive stopped the blades i guess its getting stuck somehow. should this servo make the same noise as all the other servo on the heli?

You have a mix on somewhere, revo probably. I really think you need to find someone in person to look at what you have and your set up.

Glueing the pully is NOT acceptable. The pin needs to be put in and the set screw tightened to hold it. Do not deviate from the way the helo was designed. Glue might hold it temporarily but when it comes loose and your spinning maddly in the air how much damage or injury are you going to cause?

No that's not correct. I don't believe the gyro direction or gain has anything to do with this. Make sure you reset all those "guess work" tests back to where they need to be.

evan-RCU stated you have a mix (probably REVO) turned on. I think that's right.
You should never have REVO active/on in HH mode. Rate/Normal mode maybe but never active in HH.

REVO adds a little rudder command offset as the throttle/collective stick is moved for and aft.

Unfortunately, in HH, the gyro "interprets" the servo command (rudder channel) from the TX as RATE of YAW information ... not SERVO POSITION information.
At center (rudder) stick, the gyro "interprets" that a 0 YAW RATE is desired and will move the servo/blades to the limits as required to maintain the "commanded" YAW RATE.

If REVO is active, REVO changes the rudder command a little when throttle is changed. This change in rudder command is again interpret by the gyro as a desired YAW RATE change from 0 to whatever the REVO puts in ... so the gyro adds servo movement to try and get the heli to YAW at that rate.
If the heli is on the ground or is unable to YAW ... the gyro just keeps adding servo change-t/r pitch change until it does. The result is the servo-t/r blades end up at the limit waiting for the heli to start YAWing.

"... the blades move completely to one side if i reverse the gyro then they move completly to the other side. ... "

Anything ... Anything ... that varys the rudder command from the command stored at gyro init (left/right stick movement, rudder trim adjust after gyro init, REVO, some mysterious active mix, etc) will cause the gyro in HH to interpret the change as a YAW RATE change. In HH, only the left/right stick movement should do this. Anything else (trim adjust after gyro init, REVO, weird mix) will cause the heli to operate out of sorts.

Find any mix that has the throttle as master and the rudder as slave (REVO is a built in mix that does this) and deactivate it.

Digital servos "buzz" more than analog servos ... even at center with no load or binding. Is it a digital servo??
Is it bussing or really clicking???
Are you binding the servo at the limits?? Have you set the limits so that no binding occurs???

I agree with Evan, glue will not be a permant fix, replace the tail pulley before it wrecks your heli.