for the last 5 years of me operating this plane I chose not to use a CAMO contract which means I looked after the Management of my maintenance and would issue a works order to the maintenance company prior to each Annual and 6M.
Following Annual Work the Review and ARC issuance was left to them to either do in-house or subcontract as they saw fit.
Over those years 2 separate unrelated maintenance companies in my region trusted me with the Management of my maintenance.
Prior to that, before I retired, I used to pay for a CAMO contract.