I don't worrry about it. The owner of the shop I go to says one spool lays down the other stands up, my teacher says she doesn't see a difference. If I"m having a problem, which is rare, then I take the spool off and put it either in a cup or on the table and it'll do fine. I have booth spool holders and they work fine but its not an issue for me. I usually use the stand up one to hold the bobbins that are for the on-going project.