I'm wondering about the stock mutes that came on '60-ish Jazzes. Are they particularly good quality or effective? Because they're only $25 from Bass Parts Resource (albeit sold out). My dad says that the fact that no noteworthy pro bassists use them should tell me something about the quality (Jaco took his off of his '62), but can I get an opinion from someone who's actually tried them before? Oh yeah, I know about www.bassmute.com (too expensive for my purposes) and the wonder of cheap foam rubber (I've tried it and don't like it much).