Can't seem to find any info on this. Is there a set number you need for the Crafting skill to repair an item, as opposed to making it?
For example, what would be the minimum level of blacksmithing I need to repair my Spiked Knuckles? I assume it's much lower than 35 (the level needed to craft them).
As the previous poster said, 10 ranks below the items optimal equip rank. In your case, the Spiked Knuckles should be repairable at r23. With one of the previous patches, HQ gear and NQ gear both follow the rule of thumb. (It used to be that you had to be higher to repair the HQ gear)