It depends on the fit of the scraper. Some can be pretty loose. I’ve seen them where the fit to the crank and rods was a bit wonky so to save the scraper and make it fit properly they opened up the bolt holes. A dowel would be a good thing if that happens.
The Teflon scrapers are a self fitting scraper so you install them with an interference fit and they end up where they are which is pretty close to zero fit.