Wait! Your rack shelf is touching the bottom of the spindle housing? Are you sure your shelf hasnt warped? What is this shelf made out of? Ive never heard of a REGA sagging?! If this is indeed happening I'm sure REGA would love to hear about it! Also, the retailer. Make sure its perfectly LEVEL and placed on a proper shelf (when I had a REGA I used Mapleshades 2" maple platform with cork and rubber Mapleshade feet) or even a piece of granite works really well for isolation.
Matt M
Matt M