Started making the blower crank hub last night, another evening on the lathe, I chose to use a bit of 4" OD EN40 steel bar, tough to turn but ideal for the job. After a few hours I had this, Its a little long at the moment as I need to hold it to broach the double keyway, will trim to length once thats done. Drilled the 6 bolt pcd into the pulleys I got the various parts back from vapor blasting so nice and clean now. Stripped the blower down to get it all clean and fit new bearings and do the required modifications, during stripping everything was centre dotted to aid in reassembly to keep everything in sync. Undoing the gear bolts was a task as this blower has never been apart before, a bit of softwood jammed in the rotors stops any damage. As the gears are helical they have to be pulled off together, a bit of scrap aluminium and some bolts were used as a simple puller. Again the gears were centre dotted to aid reassembly. Heres the empty case ready for vapour blasting. These holes in the case both ends have to be tapped 3/8"NPT and filled with pipe plugs to stop oil. .