Re: 9 Frame Spacer
1+ not using the nail in spacers. i spent a lot of time last year putting them in, and twice as much time this year taking them out.
the biggest problem is that they give small hive beetles too much sanctuary. and it is harder to get the frames out as mentioned above.
i just eyeball the spacing for the nine frames in my honey supers, (still use ten in the brood chamber). and yes, your honey combs will get drawn out thicker making them easier to uncap with the knife.
beekeeping since june 2010, +/- 20 hives, tf