Seat belt rattle help

[howzzzit]

My 72 seat belt buckles rattle like heck when nobody is using them. I of course wear mine and it doesn't rattle while wearing. It doesn't take much of a jolt to make them rattle. I know what's rattling it's the roller. (not really a roller because it doesn't move.) Guess you would call it the tensioner. I opened two buckles and both with floppy tensioner. Anyone know of a fix. These are original lap belts and the push buttons and springs are fine.