Oh the 2mm lead holders. Would be the best of both worlds if it were not for the price of the leads...
I mostly used Mirado HB pencils before switching to 0.5mm mechanical pencils in 6th grade. Then things stayed that way until a few years ago when I found a full box of Eagle Mirado True Medium (F2½) 172s, which are 174s sans eraser, in pristine condition. And now I'm into vintage pencils as well.