external BB spacer question
i bought an FSA crankset this weekend at a swap meet that uses the Mega eXo external BB. i've never installed one myself, though i have plenty of experience with other BB's. i looked on park's website and the process seems as simple as anything else, i just need to buy the wrench for the cups. (my BB has already been faced from prior BB installation).
my question is about the spacers. my BB is 68mm, and the options they offer use 2 or 3 spacers in different arrangements, depending on the derailleur used. i am using a single speed setup with a cassette rear hub, so i can space the rear cog wherever i need it to be, i'm not worried about chainline, but the crankset/BB i bought only came with one spacer. if i only use this one, will it be enough to put the BB cups far enough apart to install the cranks correctly? my fear is that without enough spacers, the axle will stick too far out the non-drive side. should i hunt down another spacer or two? thanks!