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I had an issue with my Sigma 1.4X TC where it became loose after several years of use. I fixed min as follows:
On the camera-mount side (where TC attaches to camera) I removed the tiny four screws. Then I very carefully lifted up the metal mount being careful not to damage the ribon cable which is attached to it. I DID NOT complete remove it, I just tilted it up so as not to damage the cable. I then tightened the 3 screws that I found below that as all three were loose. I think that there may be four screws, but I could only see 3 of them without removing the plate further. after tightening the screws and replacing the metal plate and the four screws holding it, the mount was again tight and the attached lens functioned normally.
A lot will depend on how close you are to the subject. If you are at maximum lens length 300mm and you are not getting a sharp pic, try leaving the lens at 300mm then bodily move the camera and lens backwards away from the subject or closer to the subject until you see it become sharp in the viewfinder.
It all depends upon the lens. Not all lenses can accept teleconverters, usually due to projecting rear elements incorporated into the individual lens design. With such lenses, manufacturers will either advise that a particular lens will not be compatible with a teleconverter or for some models may produce a custom matched model usually for that lens alone.
Which exact lens are you trying to fit to your Sigma 1.4x EX APO DG teleconverter?