I am working on a buddy’s bike and removed the raceface aeffct crank to install a new chain ring. I was very careful not to drop or lose a spacer. Never removed non drive side with axle. When i reinstalled the crank there was about 1-2mm of side to side play, like a spacer was missing. I reemoved and confirmed the spacer was installed in the proper direction. Also, this came with a self extractor cap. I tightened down the extractor cap as tight as possible without risking damage, and reinstalled. The amount of play reduced. Now it is less than 1mm, but i can still feel a tiny gap when i push the cranks from side to side. Seems a .5 or 1mm spacer would take up the space but i dont have one in the proper inner diameter. I didn’t check for play before taking the crank apart initially so this might be an old problem but i would like to fix it. Does anyone have any tips, ranging from a home fix to where to source a 21.5 mm (as measured by my caliper) inner diameter spacer?