Yes 

1. If there is ever any more than a slight amount of rotational play, you may want to try tightening the lens mount adapter so it will hold the lens tighter to the mount. There are 3 flanges in the middle of the adapter (what the lens locks onto) that are split open slightly, this gap is what gives the tension that holds the lens tight to the body. Over time and with use these gaps decrease in size, no longer pulling the lens tight to the adapter, which allows the lens to move inside the mount more than it should.
2. To tighten the fit, get a slim metal object (a #1.5 or #2.0 small flat eyeglass screwdriver is ideal) and insert it into the slit to open it up just a little bit (see images below, make sure to do it to all 3 evenly). The more you open the gap, the tighter the lens will be to the adapter; too much and the lens will have a hard time mounting so make sure to do it just a little bit at a time to all 3 flanges evenly, it doesn’t take much at all to get a tight fit.Note: please do not use too much strength, or the shrapnel will be damaged.

 

Yes, it should work with any camera to clean your sensor 

Works great...I had a sticky bit of dust on my camera sensor that my Rocket Blower wouldn't remove. So I purchased this product and it worked great. I used the dry approach not using the liquid. Liquid used is a last resort 

The size is important because they are made to be used with a single swipe The sensor is not the issue it is the oils in the lens chamber and if you touch that with the swab you have ruined it and can mess your sensor up badly... if you use a smaller size one it can work but I would want a sensor loupe to see what I am cleaning up and also to make sure my swab is clean and I am not taking particles that I picked up on the 1st swipe and running that into another part of my sensor... The sensor is the eyes of your camera... Hope this is helpful.