So I picked up this old 60s Raleigh frame and built it up a few months ago. I had to file the front drop outs for the wheel to fit up front. No problem. From day one of riding though the bicycle has been veering slightly to the left when uncontrolled. Is this common for conversions? Is this an issue of any importance? It's only significant when I have to do something briefly that requires no hands. I have to lean awkwardly to counterbalance. So, if I were to file down one of the drop outs a little more would that be a good solution?