I've rebuild over 50 engines and have hooked up a hundred stereos and for the life of me I cannot get the original antenna off. I tried holding the 4 slotted wheel with plyers and turn the antenna with a crescent wrench but it won't budge. I can move back and forth just a tad but then it feels like it's just gonne break if I go any further. I can also turn the slotted wheel about a half turn either way and then it feels like something's gonna break. can someone please tell me what unscrews so I can go ahead and give it more torque?