I’m using CYS8503 digital servos’ of course you have to hack the same way as the other ones. Is easy to get the pot out and removed the stop on the gear to convert form 90 degree to continuous 360 degree plus the price is 16 dls each. They are 30 kg and 90 degree . Aliexpress the app for android phones. They’re really strong and quick response. Just a comment.