Hi guys, I am building a small scale plucker, similar to this: http://www.millerwelds.com/interests/projects/we-build/home/project/4876720788 In the book that I follow to build it, the cylinder with the plucking finders is 4in diameter. I have stuff on hand to build one with a 3in diameter. Would that be too small? Trying to reuse what I already have rather than buying new.. Thanks!