For the price a camera technician would charge you could go out and buy a new one.
You may as well look at repairing it yourself, the linkage in question is probably just under the base plate and there may be screws you can remove to access that.
For what its worth, I'd buy a new one first then take the old one apart for the fun of it. This is a very old and cheap design, you could very well find another similar lens for less than $50 used.