By Cerberus.Saithorx 2011-11-03 09:26:14
My understanding is that this is an improved, "Repair Furnace" option.
Repair Furnace is 6 light fewell to repair durability by X amount.
Restorer's Touch is 10 light fewell to repair durability by Y amount.
Y being stronger than X. Only at synergy 55 so far, so I haven't bothered while I've been skilling up since I don't care when the furnace gets to 0 durability.
You may have to spam it a few times to see the durability increase.