I´ve just got a Marttiini lapp knife but the sheat is to tight I can´t get the knife out when it´s put all the way in, only if I use all my strength. Can I reshape the leather and have a good result? If I put the sheat in varm water untill its soft then put the knife in? The steel rust resistance but it will rust if it´s to long in water of course how long must the knife be in the sheat, untill it´s dry?