I recently upgraded my Bowser Turntable with a motor kit from Millhouse Studios - forum sponsor - highly recommended!
( Edited 5/17 7:00 AM) At one time Millhouse Studios sold a Bowser drive upgrade. From the website.
Bowser drive upgrade kit. Click on the underlined phrase to link. Stangtrain, thank you. Second look I found the Bowser kit.
Bowser TT's had two problems, (1.) the 3/8" drive shaft would bend, and (2.) the pit track boggies tended to drag. Millhouse River, and Diamond Scale TT's, addressed the Bowser problems and work well.