Info on a sherline wood lathe

Hi all I am hoping that some one can help me I have a sherline wl600 lathe which is a discontinued because it is 30 years old I don't have a manual and have searched the net with no help I am not after a manual I just want to no the shaft screw size so I cAn purchase a bowel chuck which I have found a seller that can make one for it but needs this size the lathe is fixed to a bench and is too hard to remove and am just looking for a easy what out I am hopping that some one can help me thanx jim