Slipping/Clicking Landing Gear

Most likely you have stripped one of the gears or the shear pin due to over extending/retracting the legs. The clutch usually survives much better than the gears. Re-building the leg is pretty easy. There are lots of PDFs on the Venture Mnfg. (maker of the landing leg) web site to aid you. Last time I looked a replacement shear pin was $0.25, gears if needed were around $35, and the entire leg (if you don't want to deal with repairing what you have) was around $150. The part number is printed on the underside of the cover. There is a difference between the left and right leg so order the correct one.

There is only 21" of movement in the leg. Mark the leg so that you never use more than 19" of it and you will not have a problem in the future.