After posts and discussions here and elsewhere I decided to dig out some of (what I could Find so far ) Uni's and explore their
guts and noticed some quality but a lot of cheapness too.
The Reel could be a little beefier in the Gears for one thing and better tolerances on the slide mechanisms but all in all if you keep all the screws tight internally IT performs quite well .
From my initial tear down the only difference between the 63 and the L is the lever (part # 1231 in Diagram here
https://zerohourzebco.createaforum.com/index.php?action=dlattach;topic=87.0;attach=295 ) inside that moves the Spindle shaft for casting in and out along with the name on the side plate which seems to me that all you need to do is make or get the other lever to which you want the right or left retrieve for and install it . Haven't done this yet but am going to see if it works. The lever is not interchangeable as in side to side and all I can find in my stash are Reels with the handle on the Right side but I know I have some more of these somewhere ,.
Pix and more later...............