I have a 16" khukri I rec. from Uncle P. When I first rec. it the khuk was pretty easy to withdraw from the sheath. Now it takes considerable effort to remove it. What gives? I am thinking the rosewood liner shrunk up some. How can I best remedy this? This is the second khuk I have owned. Without adoubt one of the sharpest knives and most robust cutting tools I own. I use a user I rec. from him more than this one. This seems to me to be almost presentation grade so the withdrawal thing may be a moot point but still would like to remedy the situation. As always any and all comments and thoughtfull suggestions are appreciated. Keep'em sharp and Happy Holidays.