I just completed this on a mid-2017 iMac & all went well except for the fact that even though I replaced a Seagate with another Seagate (1TB to 3TB), the fan was constantly on full blast. So, I had to buy the OWC dongle and open up the iMac again to install it. Just completed that & now all seems well, nice & quiet!
Agreed, wast of time to fully remove the speaker.
I just completed this on a mid-2017 iMac & all went well except for the fact that even though I replaced a Seagate with another Seagate (1TB to 3TB), the fan was constantly on full blast. So, I had to buy the OWC dongle and open up the iMac again to install it. Just completed that & now all seems well, nice & quiet!