El Cid
It is highly doubtful that the ferro rod is harming your Bravo-1 blade. What you're feeling are small globulets of molten metal from the firesteel adhering to the blade. They'll come off.
The spine is not squared enough as someone pointed out, and it's therefore not able to "grab" the rod and grind off the ferrocerium.
Try this: alot of people strike a firesteel using the power in their arms. At the end of the stroke, the blade comes off the end of the ferro rod and the tip either strikes the ground or messes up the tinder pile or both.
Assume you're right-handed. Hold the ferro rod in your left. Place the Bravo-1 spine against the rod and place your
left thumb against the blade. Use only the muscles in your left and right hand - use no muscles above the wrist. Now, tighten your right hand and left hand muscles, using the thumb to put pressure against the blade and your right hand to bear down on the blade against the rod. Short, powerful strokes can be obtained. The stroke is only about 3/4". The knife never leaves the rod. Your sparks (globulets of molten metal) will be larger and your tinder pile won;t get messed up.
My Bravo-1 does fine, but there are probably small differences in how squared the spine is on different knives from BRKT. Still, you should be able to get a spark.
I have yet to find a knife in my collection that throws sparks better than my BM Nimravii, but all my Bark Rivers throw sparks - some better than others.
I doubt your steel is harmed. It's molten metal stuck there!
