Oh BTW , did you use a book of matches or your pocket comb to jam into the face of your 8 Track player to stop slippage ?
Yup. But I found match books to work best. 👍
As to redoing the crossovers, check out Kenrick Sound over on YouTube. They do an amazing job of restoring and improving the crossovers on vintage, as well as modern JBL speakers.
After a couple of years I just may go and look into doing just that with my JBL 4319 monitors once the upgrade bug bites.
All the best,
Nonoise