Top positive review
Probably wise if your pen is old
on 25 April 2017
Go for this rather than the standard version - the cost difference is negligible and this works better.
I bought it because I was concerned the very tough plastic of cartridges must eventually strip the thread from my pens, which are old, with replacement parts harder and harder to find. I finish up with inky fingers but that's a price worth paying to preserve the pens.