Hello Signrios,
It looks like the bracket which holds the blade holder is damaged and/or broken. If that is the case then a new drag head would be required(part # 399-610). If the bracket is broken then you would just need a drag head cover(part # 391-222). If it is the drag head it may cost more to repair the unit than what it is worth, so it may not be advantageous to purchase that unit.
You are welcome to contact Summa technical support at (800)323-9766 if you would like to troubleshoot this further.
Hope this helps!
Best regards,
Phil Johnson
Summa Inc.