I have a B13.5' model. Is this a 17' ? My jack is on the driver side. what is the name on the pivoting clamp. I don't know if the co. still exists. what do you mean by pin slips out ? Your jack looks like it has a new wheel replacement welded on. A larger picture of the frame showing where a new bulldog jack or other brand might be welded on. I have never tried to unscrew my jack all the way out. I don't know if it comes apart. My screw handle knob came off, I drilled out the cap and put it back on with a bolt and two locking nuts.
service in BC Canada 1 250 503 2221 may have an answer. This is a company owned by the builder of our older Bigfoot
trailers, not the new trailers