I have an STH 234 fly reel that probably dates from the late 80's-early 90's. The only markings on it are "STH 234" and "Made in Argentina". It is wound with a DT3F line. My question is, how do you switch it from left to righthand retrieve?? The guts of this reel are very simple. It appears to have a cork drag adjustable from a small knob on the outside of the housing. I've done a little looking online and don't see any current STH reels that look exactly like mine. I tried one phone # for STH customer service (found online) and it was a wrong #. Anyone have a clue about these reels?