Drill two holes in base of phone, widely separated, near what will be the top of the device when it's in place (see photo above). (epolitics.com)
The HTC Desire HD base of the phone, which houses the microUSB port, used for both charging and also the data connection. (onemobilering.com)
At first, as I discussed in my hands - on, I loathed the Taptic Engine because it makes the entire base of the phone feel like it's vibrating, similar to the haptic feedback featured in some Android phones but considerably more intense. (mobilesyrup.com)