With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
Tell us about yourself!
Welcome to Concrete
Mixing + Pouring Concrete
Noticed these were all wood. Dealing with metal needs a totally different approach, apart from the cut groove and extract methods. With metal heating and cooling works. For the cooling lighter gas is good. It's the expansion and contraction that works. Shock also works, hitting the top with an old screwdriver and hammer. As for rounded bolt heads.....
Join 2 million + to receive instant DIY inspiration in your inbox.
© 2016 Autodesk, Inc.