[Sawrock]

Onigan Blade (Sword Blade)
Adds sword type of Katana. -10 Hit. +5 Critical.

Shortsword Blade (Sword Blade)
-1 Power. +5 Critical.

Long Hilt (Sword Hilt)
+10 Hit. -2 Power.

Trident Tip (Spear Tip)
+2 Power. +2 additonal Power vs. Aquatics. -8 Hit.

Power Pole (Spear/Axe Pole)
+1 Range. +10 Weight. -10 Hit. -10 Critical.

Crossbow Body (Bow Body)
+5 Weight. +5 Power to Arbalest skills. Made of ore instead of wood.

[Ryu-Kazuki]

These are nice, not sure what I can add to it, but I like them.

[Mivereous]

Not sure about being able to make every sword a katana, but I like the rest of these.

[Ranylyn]

Power Pole (Spear/Axe Pole)
+1 Range. +10 Weight. -10 Hit. -10 Critical.

This is the only one I really don't like. All those drawbacks. Holy ouch. I think only an Arbalest would ever use one.