I have installed only a total of 4 soundposts, and I would like to share my easy method. You will need a twistie, a small flashlight/headlight, and the 5-star tool.
First, make a vertical pencil mark above and below the slot in the soundpost, so you can see the slot easier once it's inside your violin.
Then take a 3 3/4 to 4-inch twistie (the kind you get on a loaf of bread with the thin metal strip inside), and twist one end tightly (just one revolution) around the soundpost above the slot. Tighten it a few times to make sure.
Insert the soundpost thru the larger hole on the treble side, so that the end with the twistie goes in last.
Turn on your flashlight and position the soundpost to your desired spot. You may be able to wedge it in with the twistie alone. You may need your 5-star tool (like I did) to further adjust or wedge the soundpost.
When your soundpost is finally situated, unwind a paper clip (or a long sewing needle would do) to undo the twistie from the soundpost.
If you don't have the 5-star tool, you may be able to unwind a large paper clip and adjust the end so you can move/nudge the soundpost.
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