Hello Jim.
I hope you got your K4a going to your satisfaction. I can assure you that the spool link referred to you by srs5694 works very nicely. I am the same person who created it, as my sample came from Ukraine without a spool. Rick asked if he could put my sketch onto his site, and I was more than pleased that he would have it there. To make one, all one needs is a tiny drill bit (I used a No. 60, same as for holes in circuit boards), a nail file, a Dremel tool with its standard abrasive cutter disk, a little bit of single strand copper wire (about 22 or 24 gauge), some small pliers that can cut the wire, and a few minutes time... about 20.
The design holds the spool on axis, keeping it from wobbling while loading and when turning. Since the spool turns freely inside the captured cap, it won's scratch the K4A's inside paint either. And it is FREE. Free is good.
Rick Oleson says that about the only thing that ever goes wrong with a good working K4a is that the ribbons need replacing every decade or two. With his guidance and sketches on his website, and a little Arsenal ribbon from Oleg in Moscow, I replaced those in my K4a several years ago. A little tedious for a hobbyist such as I am, but no problem. I had been winding mine on way too snappily, otherwise I probably would not have caused one of the original ribbons to detach. I wind more slowly and deliberately now.
Good luck with yours. I am now looking for a proper 50mm brightline finder for mine. That tiny little viewfinder is tough to see through with glasses. BTW, I put a donut of black electrical tape around the viewfinder window, and now it will no longer scratch my glasses, even if I press them tightly against it.
Happy day.
Henry in Atlanta