Hello folks,

I have been putting together this semi-hollow bass and am a little confused about a few things. Was hoping someone could help me out ...

1. Timber Bridge:
I am not sure how to attach this and could not find any videos to help me.
- Do I need to screw it to the body or glue it?
- What holds the top piece in, as it falls out - is it just the strings holding it in place?
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2. Angle??
- I have no idea what this is for. Im assuming this bolt comes with it?
Please could someone let me know? Thank you!!
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3. Triangular plate??
I have no idea what this is for. Please help
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4. Neck-to-body attachment:
- When I align the screws, there is a gap (see image). Logically, I am thinking that the ebony on the fretboard should sit on top of the body (there is a lip).
Do I need to screw new holes so that it sits flush?
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Thank you for taking the time to help!!