A few more things accomplished. I've decided to use the original guitar section bridge for the bass bridge. This is a smaller and lighter bridge than the previous bass bridge, plus all the existing string-through holes that were drilled line up perfectly. So in the first picture, I line it up and mark the location with masking tape:
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Then I remember I need to add a ground wire for the bridge, so I have to drill a hole - a long hole. In this pic, I used a Forstner bit to inset a shallow hole. This will help my drill bit from "slipping" as I try to drill on a steep angle.
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Then I drill the long hole from the bridge area to the control cavity (This is a posed shot, since I needed to be accurate).
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Then I ran a grounding wire through the hole, and screwed down the bridge in place so that the wire is mashed against the metal of the bridge plate and therefore will provide an electrical ground when it's soldered in place in the control cavity area.
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Either strings or electronics are next. Since I don't have any extra sets of guitar strings - it's on to the electronics. Unfortunately, I need to order a 3-way switch, so I can't continue until it arrives. More delays...