How could i lower the power to this unit to make the motor go slower

[beatles2011]

Hello, i need some help.

I have this record lathe (below) and it operates like a normal record player but just that it cuts them (records). This units motor runs at 78rpm which is a bit to fast for making records now as at 78rpm i can only cut 3 minutes of music. I want to be able to slow the motor down without having to modify anything inside the unit if possible. Is there any type of device / unit that i can attach between the 3 pin mains plug and this unit so i can slow the power to the motor down which would mean the motor would slow down so i can record more music onto a disc.

Let me know if there is anything and if possible link me to a site which would sell such a device, preferably with a digital screen to lower the power (to make the motor run at about 33 or 45rpm or somewhere around that)

Help greatly appreciated. Pictures attached below. Many Thanks

 

[Lucien Nunes]

Please see my answer on the other thread.

 

[Marvo]

Duplicate, please see here