Which machine do yo have. My tripower didn't have a front seal. The rear is felt. You can buy square felt from california rubber. The bearings are greased . To install the inner race you need to heat the inner race of the front bearing to about 210 to 230 degrees and it will just slide right on. Then grease the front bearing with quality bearing grease. Then tap the front inner race into the clean housing. Anything left in the housing will affect the runout of the spindle. Then tap in the rear outer race into the housing. Then grease the rear inner race. Now you should be ready for assembly. slide the shaft into the housing. Then slide on the rear inner race and tap it onto the shaft. I have a long bearing installer that was custom made to do this so you will have to figure that part out. It should tap on and should be tight. Then install the rest of the parts.