I'm staying away from this one!! Except to say that just because you have something hanging around doesn't mean it's good to use anywhere. Recycling isn't always a good thing

My 2 year old Brother machine came with Class 15 plastic bobbins, and they wok the best. The metal ones have notches that catch the thread and cause terrible nests or breaks the thread in my machine.

Yes It does matter. Talk to the people who service your machine. I got a talking to from my service man. I was using metal and he told me to use plastic. :oops:

Doesn't matter.......so long as it works good.

I've got an older Singer Merritt machine model # 4552. (from my sis in law) I need more bobbins. There is not one word in the manual about which Singer bobbin is correct. I started to buy some spare bobbins from JoAnn's the other day and found several Singer bobbin types.

The one bobbin I have has nothing on it except "Singer". I'm going to have to take the bobbin to town and probably open a couple packages of bobbins to see what is correct. I have some spare bobbins from another machine and they are about 1/16th of an inch taller-------------just enough that they won't work.

I even went to a Singer on line site for my machinea and still can't find what bobbin I need.

GrannieAnnie, it looks as if your machine takes a class 66 bobbin. Here's an online parts store listing parts for your machine:
http://www.sewingpartsonline.com/Sin...ine-parts.aspx

Bless your heart! I obviously did not find the right link. Thanks again!

I was told quite a few years ago by my Jamone serviceman that I shouldn't use the metal ones in my 9000 b/c of a magnet in the bobbin case and that it wouldn't spin right( I hope I'm remembering correctly) I guess my advice to you is use what came with your machine and/or check with your serviceman to see what they say. This particular guy also said to only use Organ needles in it b/c that's what he adjusted it to when he checked my machine. But the place I take my machines to now says I can use Janome, Schmetz or Organ.

David, use the coupons at Joann's and get some new ones!! Doesn't seem like there is any correct answer and everyone has different opinions. I also have a Brother and some old metal bobbins from my old Singer, so I use plastic in the Brother and use my old metal ones for "thread on the go" so I don't have to lug spools with me to do a little sewing away from home. Those spare bobbins fit nicely in those clear plastic pill dispensers (the daily/weekly ones) or like I bought at Joann's, one that has a spring lock bar so they don't accidently open. It was only a couple of dollars and I still used a 20% off coupon and each compartment fits two bobbins.

I suggest you call the shop that you purchased your machine & ask them. When I bought my BabyLock the sales lady told me NOT to use metal bobbins.