I have been asked recently what type of bobbin holders I use for Pearsall's Silks.

Ken Newton Professional Ceramic Bobbin Holders, available in Standard or Mini size,
Mini Bobbin Holders suit Pearsall?s size bobbins, for all other sizes use the Standard Bobbin Holder.
? 12.80 about $25.60.
They are not cheap, I have had mine about 7 or 8 years and they were cheaper then.

Had no image, should be ok now.