You mean like some others have already suggested???
I didn't see any posts mentioning a leaf style toplink, though could have missed it.
I did see a post mentioning the lever locking style link I mentioned, and that's why I brought it up -again-.. this thread seems unreasonably long on such a -simple- subject.
if a threaded toplink is sooooo wore out that you can't keep it tensioned without extra hardware.. IMHO.. it's replacement time.. or at least.. *adjustment time.
if replacing.. might as well go with a style that is made to stay locked without the use of tools.
* if the internal threads on a toplink sleave are sufficiently wore IMHO.. I'd weld a low penetration pass around the OD of the sleave where the threads are located. A 6013 rod on 90a should do it.. or a 115v wire welder.. should shrink the sleave to get more of an interference fit at the threads. I'd weld a lil then check.. don't want to get it too tight. If it doesn't work.. nothing is lost but a few minutes of time and an electrode or two, and the toplink is still in need of repalcement as before.
Another way to shrink the sleave would be to unscrew the ends and then take a sledge to the open face on each side.. a few blows should flatten the ends, and thus shrink the ID a bit .. though this method will only shrink probably a thread or two deep. I like the weld idea better. Have done that on an axle nut for a large truck hub where the axle threads had mild wear... made a quick shallow pass around the 2+" nut across the flats, and it shrunk that sucker perfectly.. torqued it then using a pipe wrench.. but later went back with a die grinder and file and made a set of flats for a standard wrench increment so it was a lil more user friendly next time I worked on it.
Incedentally.. these same tricks work on many situations.. like a grease fitting hole that is stripped.. whether threaded or driv ein.. remve loose fitting, and then hammer onthe hole, then rethread or reset the zerk.. then you can even stake it in with a prick-punch for even more shrinking of the hole than just the hammering.
soundguy