This is my version of a DIY ant moat for a hummingbird feeder. I looked them up, and those question-mark-shaped screws are called either 'crown bolts' or 'cup hooks'. Very cheap at a hardware store or Target, etc. ...
by Cool2Craft
by VideoBox
by HMakeup
by Origami 4ik
by How To Cake It
by Craftastic
by MrGlenn DIY