Hello, would like some advice on servicing an old rather muddy sach 3X7 that is getting noisey. The bearing look dry to me. I have not taken apart the hub yet to service the bearings and woundering how hard will it be. The free wheel attcahment part of the hud bearings also have a signifcate amount of play.(the hub mount not the freewheel bearings) I have a spare sach 3X7 also.