I was cleaning the pivots on my bike today and when i pulled out the screws on the rear pivot above the dropouts 4 washers droped out. I was only abe to find 3. I usually go out riding early on sundays to beat the hot summer sun but the hardware stores will not be open then. Can i damage the bike if i ride without it once?

I have a k2 attack 2.0 2k.

Thanks for your help.