Actually you should use the paddle because you don't want to incorporate too much air so as not to get air bubbles and smoothing issues. You actually do use the paddle for most things, not the whisk. The paddle is also used to mix your cake batter. The whisk is used to beat egg whites or yolks and to whip cream. More often than not, you will use the paddle for most other things.
Hugs Squirrelly
Edited to add, if you are mixing up royal icing, well there the preferences vary. Martha Stewart suggests using the paddle attachment. But sometimes your royal might dry out because it mixes a bit slower this way. The premise is likely to avoid too many air bubbles in the royal. Other people recommend using the whisk to make royal icing and letting the icing sit really airtight for a few hours to allow those bubbles to surface.

Awwh kiddo, I am sorry! Try sticking to a speed around 4 and see how it does. Slide the speed over gradually too. Make sure the KA is level on your counter too, I actually had it make a weird noise because it wasn't level. Oh, are all of the feet in place? I ran it one day and it seemed level but made a weird noise. For fun, I turned it over and a rubber foot was missing. Hadn't noticed it coming off and with so many feet it still felt level. The female cat had noticed it though, took me two days to find it underneath the china cabinet.
Honestly though, I wouldn't worry about it being re-furbished at all. Often they are taken back for no good reason at all and they are checked out thoroughly before being sold again.
Hugs Squirrelly

you're ok, there's nothing to take care of, it happens all the time. When you hit the report post, all it does is send the name of the author of the post of where you hit the button, and your name, thats all and then the moderators, or admin can either delete that post of edit etc. You're ok,
but thanks for your concern.