My son just gave me a 70th birthday present of a MB PIX 116577 roller ball. It is gorgeous to look at and hold, and will make a useful counterpart to the MB fountain pens I use every day.





The problem is that I cannot unscrew the back of the pen to get to the cartridge. It appears stuck fast and I do not want to force it. What can be done?

I have not said anything to my son as it would cast a dark cloud over a thoughtful and wonderful gift. I could take it in to the local MB store, but I am hoping that there is a simple solution I can do at home.


Many thanks.

Regards from Perth

Derek