From:  Dave Cawley
Timestep Dartmouth UK
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Especially bad for vertical cut transcriptions if unsupported. -Mickey

It's an overhang of 2" on either side, if you put a record weight on, there is no audible difference in the supported or non-supported area (IMHO).  
I had the SL-1200 conversion at the ARSC Conference and everyone was happy with it.

To see a 16" record placing click here

To see a 20" record playing click here

The above were recorded on an iPhone using the built in microphone.