The brush I am talking about is a half cresent and flat. I have a Janome Platinum 760 and a Viking Mega Quilter. The 760 I take the bobbin holder out and use the brush to sweep really good under the holder, then inside the bobbin holder and then put it back together. I sew every day so I do this at least once a day. The 760 has a drop in bobbin and the viking has a vertical. The brush has a long skinny handle and I have no problem getting it in there. You would think that they could come up with something though to address this problem. I guess the only thing we could do ourselves is to use a thread that is as lint free as we can find till they come up with something better. Of course, you know that it will add major $$$'s onto the cost of the machine that has it!!