I had corrosion on the inside of the blade holder on one or two of mine. I just ran a soft thin cloth through it with acetone and then wd-40 on it. Seemed to clean it up just fine. I had one that was loose and the former user had put a piece of masking tape on the blade spine so it would hold tightly. Then left it in for a few years. I had a helluva time getting the blade out - broke it once. However, it finally gave up. That one also cleaned up with the acetone/wd-40 trick.
After you clean it, the blade might be a little loose. To tighten the blade, I just pinched the holder near the back end with a pair of small pliers - watching closely so I didn't kink it. I used small pliers so I wouldn't get more than I wanted. The spine is pretty tough so you have to squeeze it pretty good with small pliers. You could probably use a pair of Vice Grips and sneak up on it by closing the Vice Grip jaws slowly and then clamping the spine until you get it where you want it. In another hobby I have used that trick to break small Christmas bulbs without ruining the element.
Last edited by ladykate; 01-23-2013 at 02:09 PM.
Inventor of the world's first safety vibrating Kamisori with night light. Go to http://badgerandblade.com/vb/showthread.php/299465-A-milder-Kamisori: Inventor of the Weckisori - (thanks sychodelix)