Had to replace a spindle housing on my 52" TTHP. I am new to this type of repair so I buy the new housing that comes with new bearings and I use my old spindle that was still in excellent shape. I got to toying around with the old housing and took the bearings out and the sleeve in between. I drilled a hole in the middle of the housing, threaded it and installed a zerk fitting then pumped it full of grease. Now the new housing came packed full of grease and the old housing had no grease in it. The new housing has no grease fittings either. Does anyone think that this will prolong the life of the bearings by doing this and does exmark intentionally leave off grease fittings because they want you to buy new bearings? I dont know the answer to either question but I do believe that it cant hurt to have fittings on the housings. I havent installed any fittings on the housings currently on the mower just the one I took off which I plan to keep as a back up.