Rockjock
Addicted to ArboristSite
I used Valvoline multi purpose lithium grease, looked pretty similar to what was already in them.
I don't know if that will work ok. For a trimmer it will not because of the higher rpm and heat. I have had several attachments come in ruined because of the wrong lube. What I do is clean them out with brake clean, then relube with the right stuff.. it is a 4 bucks a tube and well worth it. If it can protect a landscapers 10 hour a day 5 days a week machine it will work for you as well.