1) Have any of you terminated the bottom or tops of the threads into a recess in a shelf? Like for the bottom - have the bottom be a shelf with the threads above it sitting in a 3/4" deep recess (assuming a 1" piece of wood or MDF)? My rack will be half on tile and half on carpet, and my current store-bought rack (which also happens to be MDF) is just a piece of MDF for the base and it sits in this position just fine, doesn't tip towards the carpet side at all. I'm worried that exposed threads would also hurt the tile. I've seen that there ARE casters out there that fit a 5/8" all-thread, such as those sold by Salamander. 2) Not being a particularly handy fellow (not yet at least) I don't know the answer to this: If I use 5/8" all-thread, what size hole do I need to cut in the shelves? 5/8"? Or 3/4"? I know I'm showing my ignorance in these threads... I appreciate all the help.