Ray,
It looks like my F came out of the factory not long before yours. Rest assured, the J-bar slamming to the floor probably made a lot of noise but you didn't damage any switches/sensors.
As Rich said above, the gear indicator/warning switch is located in the downlock block under the instrument panel. When the gear is unlocked/up, you can stick you finger under there and feel the little flapper. When the gear is anything but down and locked, you should have a red "unlock" light and the horn will be triggered by the throttle position. When the gear is down and locked, the green light will illuminate and, if you still have the ram air "Power Boost" open, the little amber light next to that control will light up, reminding you to close the ram air door.
Many years ago, I had a situation where the gear appeared down and the green light was on but, as soon as I pulled the throttle to idle, the horn went off. I tugged on the J-bar and it came unlocked. Apparently, the gear was down just enough to trigger the light but not fully locked in place. Consequently, I always give the J-bar a little tug on short final just in case.
Tom