You don't need a metal geared servo, you just need a decent servo. The cheap Acoms ones aren't very good at all.
I'm not running metal gears in my D4 - I've got a plastic geared KO. Its a high end servo, just not metal. Before the D4 it lived in my Cat'98. I removed it from the Cat for the D4 and replaced it with an Acoms AS7 I had lying around. It lasted less than 4 mins. The Ko has been in there for years !
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