Whether they are friction or geared the number of turns do not impact buzzing at a tuner. If the buzz is at the tuner, there is something loose. You just need to tighten the tuner up.
Geared could be the nut on the top of the headstock, that happened to me once. I had buzzing when I played a certain note, even a rattle when I shook the ukulele, but everything seemed tight becuase I couldn't move the nut by hand. I got a wrench and tightened it and eveything is fine, no buzz, no rattle.
On friction tuners, I believe that all you need to do is tighten the screw on the bottom of the tuner. If the bushing is loose, I'm not sure how to tighten that becuase they are geneally pressed in. If it is loose enough to just pull out, you may be able to wrap some paper around it and press it back in... not an easy task if you don't have any equipment to do it and not sure of what you are doing.
I once had a ukulele that had Schallers and I recall tightening a knurled nut on the back of the headstock to tighten the bushing. If you have that type, I think you can tighten the bushing.
Don't know if this helps, but hopefully it will.
John