While you have the boom apart, have a look at the gooseneck fitting. I repaired mine about 12 years ago. It's worth the relatively little effort it takes. Here's my writeup on the subject:
https://c34.org/bbs/index.php/topic,7127.msg49169.html#msg49169
https://c34.org/bbs/index.php/topic,7127.msg49169.html#msg49169