I recently bought an older model Bervac 48" snow blower I use on the 3 point hitch on my 1980 B7100. It works great at 800RPM (3 blade fan vs 4 blade), but when servicing gear box I noticed the auger shafts have no grease fittings & the auger shafts are rusted solid to the inner shafts from the gear box. I drilled, tapped & installed grease fittings but none of them will take grease. Thought about removing shear bolts (already drilled out old ones & installed new greased ones) & backing into a hard snow bank to see if they will break free. Only other option seems to be a pile of heat applied & hope it doesn't cook the seals in the gear box. Anybody had this problem?