I've left mine in since I put it there--I haven't noticed any tension issues, so its just remained. But mine is in my 8900, not my 6600--and I know its more of a pain to trade it out of the 6600. The 8900 plate just pops out inside of screwing out. My advice--due to the inconvenient nature of the plate removal, buy an 8900 and keep the blue bobbin in that
