Micro 360 Degree Continuous Rotation Servo FS90R Version 2:
a. Dead band expand from 10us to 90 us
(To solve the problem what  impossible to get a steady stop position set and drifts all over the place. )
b. Use SMD potentiometer (Reduce weight)

SKU:FS90R
Dimensions:23.2 × 12.5 × 22 mm
Weight:9 g
Operating Speed :
110RPM (4.8V)
130RPM (6V)
Stall Torque :
1.3kg.cm/18.09oz.in(4.8V)
1.5kg.cm/20.86oz.in(6V)
Operating Voltage :4.8V~6V
Control System :Analog
Direction :CCW
Operating Angle :360degree
Required Pulse :900us-2100us
Bearing Type :None
Gear Type :Plastic
Motor Type :Metal
Connector Wire Length :20 cm