Here are some inexpensive bearings. http://www.surpluscenter.com/sort.asp? numrec=86&sort=1&keyword=PBFB&catname=powerTrans&UID=2005073013152980 I used the 2 of the 2-15/16 bearing on my tower (at the top and above the rotor) and it works fine. http://www.surpluscenter.com/item.asp?UID=2005073013152980&item=1-215 -47-4&catname=powerTrans 73, Jeff, K3DUA