Towermate is a new design for your mast. it is a tilt plate that when you luff over your tower or mast the ariel stays parralel to the ground. this is good for easy maintanance, adjustment of yagis. more so when in high wind, just luff over and your antenna is about 6ft over ground.
it's locking device is automatic once up and in the vertical postion. once you start to luff over, the pendulem moves and unlocks itself.
take a look