PTT on the throttle worked fine all day but then pulling up on the trailer it quit working. The switch at the bow next to trolling motor controller works fine so I know it's not the PTT motor or relays. How do pull the shift throttle assembly out to check the switch and replace if necessary. I saw in older post that said to push in the "throttle only" know push throttle forward and pull the knob. I tried that, but the knob broke off the stem that pushes in; have it JB Welded now. Did I push the throttle forward too much? Where do I buy the switch for it once I have it out?