I opened up the bottom of my Steck Half Duo-Art to adjust the control
rods when I found a sticky substance which had built up on some of the
vinyl tubes and the substance was slowly dripping onto the bottom of
the piano and the tubing was a bit stiff.

Does anyone have any ideas on why the tubing has become sticky?

Karl Juelg

 [ Vinyl tubing
 [ https://www.mmdigest.com/Attachments/23/12/13/231213_202956_IMG_0308.jpeg 
 [ Vinyl tubing
 [ https://www.mmdigest.com/Attachments/23/12/13/231213_202956_IMG_0309.jpeg 
 [
 [ The sticky substance is a plasticiser leaching out from the plastic
 [ and also attracting dust, outside and inside. See, for example:
 [ https://www.mmdigest.com/archives/Digests/199812/1998.12.01.12.html 
 [ https://www.mmdigest.com/archives/Digests/199812/1998.12.02.08.html 
 [ https://www.jalopyjournal.com/forum/threads/red-plastic-fuel-hose.1094309/ 
 [ https://heritagesciencejournal.springeropen.com/articles/10.1186/s40494-020-00466-0 
 [ -- Robbie