I recently converted the rear axle on my 77 puch maxi to sealed bearings. I followed the tutorials via the wiki provided on this site. I made spacers out of plumbing pipe rather quickly so theyou aren't perfectly cylindrical, but fit. I've assembled the axle, and the bike rides well, but the wheel doesn't spin freely unless I'm riding it and giving it gas. I fear I may have over-tightened or that my makeshift spacers are inadequate. ..thoughts?