Just a quick query ... refinishing a frame. Have removed the headset bearing cups and now want to reinstall in the frame. I've seen people using tools and jigs for this on YouTube, but is it OK just to use a couple of wood blocks and a hammer to tap the cups into place? Happy to make up a jig with a long bolt/washers etc if necessary, but won't bother if it's OK to tap everything into place carefully with a hammer, with vital parts suitably protected. Aware of the need to apply force so that things go in square. Thanks for any advice.