Here are a few more photos of the Hofner double bass repair.

Removal of old glue from double bass seam.

The “blotting paper” (from a kitchen roll) was inserted into the seam after the hide glue was removed with hot water and various scraping tools. The paper is to soak up leftover water before it settles into the wood.

Another wedge test before “live” gluing. Here, as on the top plate, the wedge is to hold down only one side of the rib to make sure it is flush.

I believe in always testing before gluing, especially on cracks. So here is another example of a dry run (literally).