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Mittenwald Double Bass and a trip down a rabbit hole…

Sections removed, glue cleaned up, time to rebuild!

THIS IS AN ACTIVE REPAIR, BE SURE TO CHECK BACK OFTEN!

This is one of the great Mittenwald basses we have had through the shop.  The varnish is to die for, and tone is even better!  But, these things we like to haul around are BIG and AWKWARD, and sometimes you bump it on things.  This one took a little bump and got a rib crack…so the owner, a dear friend of the shop, brought her in for a patch and since we would have the top off, let’s reglue that upper brace that’s been working itself loose.

When tops come off…that usually when you find rabbit holes…

Let’s start off by just taking a look at a bit of the stuff we planned on.  Upper brace, no problem.  Rib crack, no problem. Clean her all up and redo a bunch of old cracks and cleats since you’re already in there, par for the course.

The crack…
Cleaned up and new cleats fit
New brace, joined and glued
So nice and clean!
Done! (sigh) Just getting started…on to the top…
chalk fit spruce cleat on the upper corner of the c bout

The Top.  It’s always the top. And why not…look what we are asking it to do!  Spruce…millimeters thin, holding up hundreds of pounds of string tension for centuries, getting bumped, whacked, dried out and tortured.  It’s a miracle they do as well as they do!

Miracle or lots of skilled labor and money?  Meh…who’s keeping score?

So this top has seen some pretty bad repairs, with whole sections being replaced, poorly.  And this top is thin…and dangerously thin in spots. But hey, great tone, right!?!?

We started picking apart the top, taking whole sections off with ease.

Popping off sections…
While we glue up other sections.
Thin spline fit as once we cleaned out all the old glue, there was no chance of it pulling together.
Sections removed, glue cleaned up, time to rebuild!
So thin, and with a long crack running horizontally through the piece, we need to remove more material to have a secure, trouble free joint.
A paper template is made to help keep track of the size of the spline needed
All trued up, a spline with matching grain was found and glue into place. The spline is tall and will be shaped (arched and graduated) after it dries.

Some of these cracks are so old and have been cacked up with so much glue, that when you clean all the old glue out, its a horrible joint that left, and often time there’s not enough clamps in the world to pull sections back together again.  Splines are used to make up wood that’s lost through truing up the joint.  With everything square and straight, glue up of the splines is easy and they’ll not cost the owner repeated trips back into the shop.

Trued up and ready for its spline
Not too bad coming off the lower eye of the ff hole
getting a little thin at the recurve…
Spline glued. Notice its tall, this helps us keep from distorting the arch and gives a great clamping surface…
spline arched and graduated, not to add back in the original table material…
All glued up…
tricky with the ff hole wing spline too…getting the widths right to not distort the top has been a challenge!

KEEP CHECKING BACK, THIS IS AN ACTIVE REPAIR

Upton Bass
String Instrument Company

159 Packer Road
Mystic, CT 06355

Hours: Tues–Sat, 10 am–6 pm
Telephone: +1 (860) 535-9399
Email: Sales@UptonBass.com

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