I like to take a hammer to a piece of rock and make some rubble first. I use the pieces that are still small but will lay flat on the table and not tip over. I paper towel dry the rock and the bottom of the frag. Then some crazy glue gel onto the rock and let that set up for maybe a few minutes. Then I use a ball of putty with a blob of glue on each side to adhere the rubble to my rockwork. It's strong, natural looking and I can still pry the thing off if I have to move the coral.

nope its as easy as that what youll want to do is if your rock is very light or small start with a small bit a work your way up to a larger bit so as not to crack the rock, if its very dense or really large it shouldnt split.use some epoxy on each end of the rods(optional) and insert into the rock....easy way to create unique designs:):) not sure on the size of rod youll want it probably varies depending on the weight but id say 10mm-12mm wouyld work just fine:)

What kind of drill bit do people use for this -masonry bit ?

wouldnt matter really as the rock we use isnt that hard the trick is to start with a smaller bit then increase the size.if one wanted you could use a masonry bit or diamond bit but youd get away even with a wood bit.

I'd think that a wood bit would grab too much -but then I haven't tried yet ! One thing is for sure, with the exception of the masonry bit, anything you use is going to be junk afterwards (or need a serious resharpening !)

a wood bit probably will if you use a drill with a low rpm or a large bit but if you use a electric drill it would be fine the rock we use is really soft in the stoneworld of things but to be safe just use a diamond bit like we use for drilling tile they are small and have a spade shape top,using some water wouldnt hurt either to keep it sharp(i work doing tile and other stonework)

if you do use a wood bit it wont be no good for anything else lol if the rock your drilling is real hard then i would not use any bit beside a masonry bit or diamond bit as any other bit will just melt away from the heat.

I use my smallest bit and do many holes in a circle then just pop out the core. Never break a rock this way.