Lamy M66 refill
Being on clearance ( I can’t resist a bargain) I purchased 4 of these for my Lamy Safari rollerball pen. I then spent hours on the internet trying to figure out why they didn’t fit, I had never replaced the original so I was surprised to find that it contained a much shorter Schmidt P8127 unit. Just as I was about to give up a small 12mm plastic spacer fell out of the top section of the pen . The M66 unit then was a perfect fit . I hope this may help you if you encounter a similar problem P.S in reverse you can cut the units plastic tip protector in half and make 2 distance pieces so as to be able to use a P8127 replacement.
