Well, I knew TSP-50 had to be accessible out there somewhere. Finally found it.
http://www.tsp.gov/bulletins/05-11.pdf
The form is attached to the bottom of this bulletin, published in 05. Says you CAN print it out but then have to write on it-pencil or ink, and snail mail it so it can be scanned. This is for those who were sent a whole whopping 3 forms for April, even tho interim and proposed regs say transfers back to G are UNLIMITED/unrestricted, after first intrafund IFTs.
If you keep a copy of this pdf in your files, even if they take this bulletin off the web, you'll still be able to print and mail additional IFTs above and beyond 3/month they think they are limiting you to hardcopy, don't have to wait for them to send you 3 paper forms or hope they refer you to their link. Keeps a little bit of power over your accounts in your hands, even with restrictions, for time being anyway.