I bought a used Bluebird aerator, #530a, off ebay 2 months ago, hoping I could generate some additional business. Well, the snow in Denver, CO has FINALLY melted off my lawn, so I tried a few passes with it. I am disappointed at the lack of plugs it produced. I cleaned out the tines before running it, and it did put holes in the lawn, but very few plugs were pulled. What do I tell my customer???