Here's a puzzler...<p>I recently installed new 3 new u-joints in my 1800ES driveshaft. Now 2 of the 3 are loose in their yolks. The cups slide back and forth a bit, as if they are either too short end-to-end, or the retaining clips are too thin, permitting movement.<p>When I installed them, I did use emery cloth just a bit to clean out the yolks, but they still took a press to install them.<p>The simple and stupid thing to do would be to squeeze (hammer or press?) the yolk tighter, but I fear that they would no longer be parallel. Or I could shim the cups in on the ends to keep things tight.<p>Suggestions? Can you knurl or otherwise tighten yolks? Is this fixable, or am I looking at a new driveshaft?