Sticky slide

[Decbox]

Hi Everyone.
I recently acquired this 3-Voice Galanti. Its a lovely instrument with hand made reeds in Double Cassotto in the LMM arrangement and a walnut keyboard.
Its got a sticky coupler slide in the centre Cassotto reeds. I'm not sure how to access it. I've done these before on non Cassotto accordions. Any advice would be much appreciated.
Sorry about the terrible pictures.

 

[boxplayer4000]

Hi Decbox, your pictures have not appeared.

 

[Dingo40]

Are we discussing a new instrument or an old but new to you instrument?
Also, as boxplayer says, no pictures!

 

[Decbox]

Thanks for replying guys. Its an old Galanti Duovox circa 1970. I have had some good advice on Facebook from Paul Debra and others. I need to remove 5 screws to access the slide. I'm sure its corroded.

 

[Decbox]

 

[Decbox]

 

[Dingo40]

For clearer pictures:
Wipe the lens with a clean tissue.
And, (during daytime) position your subject with the light from a nearby window hitting it from about 45 degrees in front and from slightly above. (Avoid having the light hit the camera lens directly.)
Get in close ( fill the frame)
If necessary (to avoid throwing a shadow on your subject), zoom in.
Music is all about the sound, photography is all about the light!

 

[debra]

Interesting... I thought I posted a reply but it's not there... maybe in a duplicate thread?
You remove the soundboard (the aluminium plate + leather cover) by unscrewing tiny screws. That gives you access to the sliders.
The only added difficulty in the cassotto is that you need a short (or an angled) screwdriver to get to the screws.

 

[boxplayer4000]

Before doing too much dismantling:
Coupler mechanisms comprise at least three elements; the coupler buttons themselves, the lever systems to deliver the movement and the slides themselves. Any one of these (or all) could be the cause of stickiness or resistance. If you can, isolate each of the elements, and test to see which is causing the problem.

 

[debra]

Before doing too much dismantling:
Coupler mechanisms comprise at least three elements; the coupler buttons themselves, the lever systems to deliver the movement and the slides themselves. Any one of these (or all) could be the cause of stickiness or resistance. If you can, isolate each of the elements, and test to see which is causing the problem.

Good point. If removing the reed blocks makes no difference (yet they are held firmly in place when they are mounted inside) then it's not very likely that the problem is in the sliders inside under the reed blocks. If you uncouple the mechanism outside (under the grille) then you can check whether the register switch mechanism works effortlessly when it doesn't have to transfer its movements to the inside.
The worst that can happen is that the problem is in the outside-to-inside transfer because with a cassotto that is hard to reach.

 

[Decbox]

Thanks for the advance. Ive had tje the coupler assembly off and it works freely when disconnected from levers. I'm see oxidation on the vents so I still suspect the slides. The offending one is the centre reed and it feels gravelly.