Diatonic accordion score fine-tuning

[Menu Jacques]

Hello folks,

I've modified the AccordionPushSpanner example supplied by someone on this list 
(can't find who it was, unfortunately), giving the attached file and the score :

How can I tune the settings to align the bar lines lower tips with the single 
staff line, and hide the dots in the repeat bar lines, in a way similar to:

The small vertical lines would be nice to have too.

Thanks for your help!
 
JM

AccordionPushSpannerExample.ly
Description: Binary data