Unless you're going to enjoy building one, and have bearings and parts lying around, then you're probably much better off just buying one. Plastic ones are like

Unless you're going to enjoy building one, and have bearings and parts lying around, then you're probably much better off just buying one. Plastic ones are like $5, aluminium (better, don't break) are < $10. They'll probably be much better than anything most people can realistically make - better balanced, for sure (again, unless you're going to enjoy making one - not trying to shit on anyones DIY fun).