This is the reply I received back from my email.
And what a load of rubbish......
.....Gee sewing machine brands tell you to only use their needles, bobbins and threads !!!!!!
Hi Jill,
We note your comments and reply as follows:
1. We are a Janome Dealer. Janome certainly recommends the use of pre-wound bobbins in their machines but only Janome brand as Janome pre-threaded bobbins are pre-wound on plastic Janome bobbins.
2. We highly recommend the use of Bottom Line Thread for both using in the bobbin or for hand sewing English paper piecing.
3. We do not recommend the use of pre-wound bobbins on cardboard for use in our machines.
4. We stock the 1420yd spools for our customers who wish to use Bottom Line Thread in their bobbins so they can wind their bobbins using the bobbins that suit their particular machine.
5. We only recommend purchasing and then rewinding the cardboard bobbins if it is a colour that we do not stock in the larger spools.
6. Our advice is precautionary. We highly recommend Bobbin Line and Superior threads but do use the pre-wound cardboard bobbins in our machines.
7. We understand that there are two main causes of machine malfunction in the bobbin area one being the use of inferior thread (which is certainly not the case with Superior threads) and the second being the use of generic bobbins especially in Husqvarna machines.
8. The main reason for stocking the cardboard bobbins in store is for hand sewing, hence the precaution you were given when you purchased the item.
We are pleased that you have no issues with these bobbins however we have had other customers who have and that is why we recommend our customers wind them on to their own bobbins.
It is not a matter of giving out incorrect information. We are giving information we are comfortable sharing with our customers from the advice we have received from our suppliers.