Installing the manual RF-IF output level DPDT toggle switch requires moving wires from the RF-IF switch to the DPDT switch. Here is how
1. Locate the back of the RF-IF switch. It looks like this
2. You need to wire the DPDT toggle switch like this
3. Remove these wires and label them. ONE AT A TIME.
4. Put some heavy tape (I used red duct tape) onto the front panel between the AUDIO and the RF-IF LEVEL switches
5. Put some tape on the back to catch the drill shavings
6. GENTLY drill a hole for the DPDT switch