I have one on my Aria Pro.
It was setup when I am of no help.
It does go out of tune a lot.
Not to many places make these any more if at all.
Have you searched the web?
You might want to try
www.mydoublewhammy.com
they are the only people I know that still make a bass trem, it is not close to the Kahler but it won't hurt to try.
Maybe they can give you some info.