I think you're talking about Moglice. There is a thread in Machine problems and solutions. I believe it would cost me at least $100 for the 4 nuts I need. I was looking into going that route. I also found a similar product, Super Alloy by Phillycast.
http://www.phillycast.com/.
I emailed them about a price and they never got back with me. If the plastic nuts don't hold up for me though, I'll try the Moglice.
Gerry