Starting Problems, click Then Start.

I'm having similar issue and am leaning towards ignition Switch aswell, but not 100% sure it's problem but atleast that general area of truck. It's '01 2wd Taco, truck would click once but not turn over. Battery is 6 months old at most. Thought it was starter. I replaced starter with new. Same thing still did not start on until maybe 5th turn of key, just 1 click each time. Tested Battery - Ok. Tested Alternator - Ok. Tested old Starter - Ok. I notice it does start if I turn the key long/hard enough, my ? would that be "Ignition Switch" OR "Key Cylinder" Or "Both".