*UPDATE 09/29/15: Printed it and still not yet tat perfect. I'll have to try on. SO far I recommend using the adapter and the original file

++++UPDATE 09/28/15: New Design publised. Not printed yet, but shuld work now. I'll report in an instance.++++

++++UPDATE 09/28/15:
Just printed it and found out, that the positions of the bars need to be a bit higher...
I will fix it and publish the right file, but I may need some time to do the changes. Hold the line!++++

The same machine as stumphopper did, just added some small bars to hold the jar.

Now you can turn it on and it will stay in place!