The only BSRs that used the umbrella spindles were the 710 and 810, plus the Accuglide XR50 and XR60.
The latter were cheaper, BSR-badged variants of the ADC Accutrac +6 (which itself was a development of the Accutrac 4000) and built in the UK but sold in the US market only. The Accutrac +6 and both Accuglides had an umbrella spindle surrounded by a motorised platform that could raise the records automatically.
Video of an Accutrac +6 can be found here in case you've not seen one in action! -
http://video.google.com/videoplay?do...7728196557555#