Dave, the issue should be just a matter of whether the motor in your Lenco is an AC motor. If it is, then the SDS is compatible.
In casting about some of the Lenco web sites I found the following comment talking about the motor in the Lenco turntables: "...A common method used by many turntable manufacturers for ensuring reliable starting and direction of rotation in AC Induction motors." http://www.freewebs.com/bornin50-2/themotor.htm
So, it sounds like yours should be an AC motor.
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In casting about some of the Lenco web sites I found the following comment talking about the motor in the Lenco turntables: "...A common method used by many turntable manufacturers for ensuring reliable starting and direction of rotation in AC Induction motors." http://www.freewebs.com/bornin50-2/themotor.htm
So, it sounds like yours should be an AC motor.
.