"when I changed it over the screw wouldnt lock down , I dont think it was fully threaded right"
happens to me too. Kershaw's notorious for it.
As far as getting left handed stuff, the devil's advocate line goes like this: 'look, when you can have two configurations for something, and about 90% of your consumers want the one and about 10% of your consumers want the other, what you're really saying is you have two items and only one of them is going to move faster. The other will move about 10 times as slow, which is to say it will move 10 times as slow as some other item those 90% of the customers might want instead. The realities of business mean that you're much better off selling that other item instead, whatever it is." Which is what inevitably happens, which is why lefties struggle to find left handed items in any proportion to their frequency in the population of people who buy things.
If you figure out an answer, sheesh. Come tell me!
In the meantime, you're probably a couple hundred times better off just buying the right handed knife that you really want but you can't find in left hand, and paying a knifesmith to convert it, than you are buying the best left handed knife you can find, unless you got really lucky with finding a lefty that's a great fit for you. That's probably going to get you further than trying to change the market on this one. The math is stark for left handers but it's not just them, it's also true for people who are in some way atypical for their consumer base in a consumer driven society. People who are very tall or short are good examples when it comes to things like shopping for clothes - outside a certain range of sizes, the people who require that size are literally more common than the shirts one can find in a store that will readily fit them. They have to special order clothing or drive hours for specialty stores, and be happy those stores exist.
If I wanted to get knifemakers to make more knives lefties would use, I'd try to find examples of clips that are easy to reverse, get them using them, and THEN say 'now that you're using these clips how about taking the extra thirty seconds for us and making your design reversible'. And I'd grab a Snickers bar, because I'm pretty sure I wouldn't be going anywhere for a while.