Once you have the bearing in your single biggest issue will be adding stiction or a brake to stop the OTA from spinning at the slightest amout of force. That's a problem I'm still battling and the COL encoder complicates things considerably. I don't understand calan's solution; my center bearing protrudes above the rocker base. Perhaps I'm being to fussy and a simple block of carpet or foam would do the trick but adding stiction is definately something you're going to have to deal with.