I haven't tried it yet, but I will when I do a coil change, if I feel like tinkering, to be honest mine doesn't whistle near as bad as it did when I first got it!
I just ordered a kayfun mini & I'm a little worried now that the quality might not be what it should after reading this! Quality of my original kfl what fantastic & honestly it's the only reason I purchased the plus & the mini, so if this starts going down hill, I won't be very happy!
Also, I am kinda regretting selling my kfl in the classies, wish I would have held on to it now!
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I'm going to put my kayfun lite plus in a jewelery cleaner ultra sonic before I start using a drill bit on my KFL I want using a drill bit to be last resort.. I'll let u know how it goes.