Pianotech

I have an institutional contract that includes caring for about a half dozen Kawai UST 9's. The grand style fallboards pivot on brass machine screws that go into the cabinet and they have a tendency to unscrew themselves over time. Routinely, I have screwed them back in on my annual visits but now a few completely unscrewed themselves and the screws disappeared. So now I'm putting a drop of carpenter's glue on the screws in the hope that it will add enough resistance that they won't come loose.

For the record, the correct replacement size is a #4m-.7x16mmmetric machine screw (Phillips flat head). A zinc plated version can be found on Amazon but the brass screws are harder to come by, I ended up getting some from China on eBay. Actually the steel screws are visually passible and the threaded inserts they screw into are also steel so less chance of electrolysis.

Uh oh...it's no longer a Kawai...  😉 

Peter Grey Piano Doctor 

I have an institutional contract that includes caring for about a half dozen Kawai UST 9's. The grand style fallboards pivot on brass machine screws that go into the cabinet and they have a tendency to unscrew themselves over time. Routinely, I have screwed them back in on my annual visits but now a few completely unscrewed themselves and the screws disappeared. So now I'm putting a drop of carpenter's glue on the screws in the hope that it will add enough resistance that they won't come loose.

For the record, the correct replacement size is a #4m-.7x16mmmetric machine screw (Phillips flat head). A zinc plated version can be found on Amazon but the brass screws are harder to come by, I ended up getting some from China on eBay. Actually the steel screws are visually passible and the threaded inserts they screw into are also steel so less chance of electrolysis.

A "Kawas" I guess, Peter. 😂

On a more serious note, is Loctite an option?

Uh oh...it's no longer a Kawai...  😉 

Peter Grey Piano Doctor 

I have an institutional contract that includes caring for about a half dozen Kawai UST 9's. The grand style fallboards pivot on brass machine screws that go into the cabinet and they have a tendency to unscrew themselves over time. Routinely, I have screwed them back in on my annual visits but now a few completely unscrewed themselves and the screws disappeared. So now I'm putting a drop of carpenter's glue on the screws in the hope that it will add enough resistance that they won't come loose.

For the record, the correct replacement size is a #4m-.7x16mmmetric machine screw (Phillips flat head). A zinc plated version can be found on Amazon but the brass screws are harder to come by, I ended up getting some from China on eBay. Actually the steel screws are visually passible and the threaded inserts they screw into are also steel so less chance of electrolysis.

Kawas, that's pretty good.

I thought about loctite but I'm not sure how tight it makes it and I'm using a brass screw. Also, it's another thing to carry around that I'll rarely use; I'm hoping the glue will provide enough resistance to keep the screw from backing out. The screws are bearing the weight of the fallboard on the flanges of the screw heads, so maybe I'll apply a drop of lubricant.

A "Kawas" I guess, Peter. 😂

On a more serious note, is Loctite an option?

Uh oh...it's no longer a Kawai...  😉 

Peter Grey Piano Doctor 

I have an institutional contract that includes caring for about a half dozen Kawai UST 9's. The grand style fallboards pivot on brass machine screws that go into the cabinet and they have a tendency to unscrew themselves over time. Routinely, I have screwed them back in on my annual visits but now a few completely unscrewed themselves and the screws disappeared. So now I'm putting a drop of carpenter's glue on the screws in the hope that it will add enough resistance that they won't come loose.

For the record, the correct replacement size is a #4m-.7x16mmmetric machine screw (Phillips flat head). A zinc plated version can be found on Amazon but the brass screws are harder to come by, I ended up getting some from China on eBay. Actually the steel screws are visually passible and the threaded inserts they screw into are also steel so less chance of electrolysis.

I would suggest Locktite blue. Treat all pianos preemptively and then you don't need it in your kit.

Kawas, that's pretty good.

I thought about loctite but I'm not sure how tight it makes it and I'm using a brass screw. Also, it's another thing to carry around that I'll rarely use; I'm hoping the glue will provide enough resistance to keep the screw from backing out. The screws are bearing the weight of the fallboard on the flanges of the screw heads, so maybe I'll apply a drop of lubricant.

A "Kawas" I guess, Peter. 😂

On a more serious note, is Loctite an option?

Uh oh...it's no longer a Kawai...  😉 

Peter Grey Piano Doctor 

I have an institutional contract that includes caring for about a half dozen Kawai UST 9's. The grand style fallboards pivot on brass machine screws that go into the cabinet and they have a tendency to unscrew themselves over time. Routinely, I have screwed them back in on my annual visits but now a few completely unscrewed themselves and the screws disappeared. So now I'm putting a drop of carpenter's glue on the screws in the hope that it will add enough resistance that they won't come loose.

For the record, the correct replacement size is a #4m-.7x16mmmetric machine screw (Phillips flat head). A zinc plated version can be found on Amazon but the brass screws are harder to come by, I ended up getting some from China on eBay. Actually the steel screws are visually passible and the threaded inserts they screw into are also steel so less chance of electrolysis.