Replaced it. Took the old one apart. It was broken internally.
I guess 40 year old plastic gets brittle.

Thanks

'75 CJ5 with all glass body and a 350 Chevy SB
'85 Chevy Stepside (the wife's)
'89 Volvo
All 100% maintained by me.
'70 valiant DD for my son
'74 Dart Swinger..Latest endeavor
http://home.lyse.net/brox/TonyPage4.html