Double Bass 3/4 Thomann Upright Overhaul

[Derek Kay]

Nice job you've done.
Other refinements to consider.

The 'sandpaper on the belly' to seat bridge feet idea mentioned by @Roxbororob is easier if you hold the bridge in position with one string quite slack. Now the feet will more accurately seat at the angle you mount the bridge. The string pressure also helps with the sanding.

I chalked the underside of the strings to mark high spots where the string rattled on the fingerboard when overplucked. Starting from the open string I worked my way down the fingerboard with scraper and sandpaper. It was a lot of stringing & unstringing but worth it.

I also merged the Romberg bevel to a normal curve at fingerboard end. The bevel is obsolete unless you use a gut E string, but is still useful at the nut end as it stops the E string being pulled sideways. This is geometry/physiology dependent.

 

[stefaniw80401]

It's prolly a little late, but it's common practice to "preload" the bridge feet, with a dowel, prior to fitting the feet. I use a small turnbuckle fitted with pads to spread the bridge legs a smidge.

 

[Transistor]

Thanks for sharing your progress. I was in a similar bad bridge situation with my first DB purchased a few weeks ago. If anyone's interested you can see my approach on Bridge replacement on Thomann Hora with factory bridge flat-side up on this forum. In particular, I made a jig to hold the bridge vertical during sanding to prevent making the feet convex in the direction of the strings. (When sanding on the body as done in this thread it's very easy to have it rock back and forth causing the edges to round off.)