Does anyone here have any experience with chinese motorized rotary stages, like 
this one:
http://www.alibaba.com/product-gs/615993083/LSDH_100WS_Worm_gear_motorized_rotary.html

I'm a bit worried about actual accuracy and amount of backlash. If it would be 
worth of buying it... anyway, is there a way to have actual position feedback 
from table, not only from motor (in case of servo motor) ... I mean 
retrofitting it with a kind of "encoder"?                                       
 
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