This is how I fit a guard. Please note this is a forged finish blade and therefore a hairline fit is not really possible because of the textured surface. If you follow this technique with a polished ricasso you will get your hairline fit. As usual, this is the way I do it, it is not the only way nor may it be the best way. Hope it helps.
![](https://s2.save4k.ru/pic/zAe1JqXfR04/mqdefault.jpg)