I installed a garbage disposal 2 years ago and all has been fine but now it's leaking and can see the sink piece (insinkerator disposal) turning a bit when I start the disposal. It's a compact, high torque? model -- pretty powerful it seems to me. I only used putty because that's what the instructions called for -- everything was tightened properly. Is putty "has been" stuff? Should I have went with something more 21st century? Some silicone? or? -- THANKS