Well....there are plenty of people around here with far more experience than I have, but thanks for the mention.
I make all kinds of tailpieces, across the spectrum of instruments from tiny little few gram things on mandolins, up to traditional heavy bricks of ebony on double basses. Two things that seem to matter the most are the individual bass that is getting fitted and likely even more, the old geezer playing the instrument in a particular style. I usually have a half dozen or so different tailpieces in the shop of varying mass and construction. The only way to tell which one is best for a particular situation is to clear off a workbench, hand over the string winder, and let someone change out the strings five or six different times and see what appeals to them. With this and almost all other setup issues, I try to remain neutral and unbiased. My opinion is pretty much worthless because at the end of the day, the owner will head home and live with the choice so I want them to make the decision.
If I was to make a generic call on the effects of tailpiece mass, I would say that for lighter basses played primarily pitz, they tend to like lighter tailpieces and respond better; even more so if you tune down to a dropped D, but for more solidly built basses that are played arco, the extra mass of a heavy traditional tailpiece seems to have a positive effect on dampening some of the unwanted overtones. I like light responsive basses, but I tend to be a Samsonite gorilla pounding the @#$% out of them every week on loud gigs, mostly rowdy pitz jazz and Django with a bit of overexcited slapping at certain moments, and at least medium Spirocores. Push that too hard with a bow and you may have a flurry of overtones and a few wolfs; too much of a good thing. Take the same bass and try to play it arco with a heavy right hand and a heavy tailpiece keeps it much more in line and orderly.
On a personal level, my number one complaint about tailpieces is why do so many folks make tailpieces with a traditional string "keyhole" with a hole that is too small for the string ball to fit through, so you have to completely unwind the strong ng and pass the whole string through rather than pop it out in three seconds???????????
On many days, people come in and already think they know exactly what they want from spending too much time on the internet and whoever writes the check gets what they ask for....and then they come back in three days and ask for the exact opposite......
j.
www.condino.com
www.kaybassrepair.com