Sirius XM RAdio Onyx Quick Start Manual page 40

Special Features
1
Place the Trim Ring Removal Tool on the Trim Ring on the Radio. Use care
to align the tool so it's centered on the Trim Ring.
2 Using mild pressure to keep the tool against the Trim Ring, rotate the tool
counter-clockwise until it will not rotate any further.
1
3 The Trim Ring is now loose. Turn Onyx over and the Trim Ring should fall
out. If it does not, gently tap the back of the Radio until it does.
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