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I purchased servo-less retracts SKU 107000136 to replace more flimsy units in my home built spit, in which all servos are digital. Received the units today but on test nothing worked. On further test found they only appear to work in analogue mode, which makes them useless for my requirement. Not had this problem with the previous (current units), they just work.
This is not mentioned in the product descriptions or specs. Very disappointing.