Module 7 added 24 new Green Steel weapon recipes to the 12 existing recipes, which caused a fairness problem as
discussed here and elsewhere. Following is a moderately-easy suggestion to resolve that problem.
Create the following 12 recipes usable in a Stone of Change
GS Shortsword + GS Rapier (blank) + Syberis Dragonshard
GS Shortsword + GS Light Pick (blank) + Syberis Dragonshard
GS Longsword + GS Scimitar (blank) + Syberis Dragonshard
GS Longsword + GS Battleaxe (blank) + Syberis Dragonshard
GS Longsword + GS Dwarven Axe (blank) + Syberis Dragonshard
GS Warhammer + GS Heavy Pick (blank) + Syberis Dragonshard
GS Warhammer + GS Battleaxe (blank) + Syberis Dragonshard
GS Warhammer + GS Dwarven Axe (blank) + Syberis Dragonshard
GS Greatsword + GS Greataxe (blank) + Syberis Dragonshard
GS Greatsword + GS Falchion (blank) + Syberis Dragonshard
GS Maul + GS Greataxe (blank) + Syberis Dragonshard
GS Throwing Hammer + GS Throwing Axe (blank) + Syberis Dragonshard
For each of those recipes, the output is a single item:
The inserted blank GS weapon, now bearing all the magical properties of the other GS weapon