not sure if u can read this, but there are full info about rings in russian -.-
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repairing:
+1-5 ring 3 durability for 1 light rock
+7.5 ring 2 durability for 1 light rock
+10 ring 1 durability for 1 light rock
U should use Magic Item identification device to repair having light rock in ur pack
They get damaged when u dress it on or withdraw
U need 107.5% of lumber at least to unlock lightwood chopping and ppl say it's much better to use +15 hatchet and lumber ring to maximize the chances
Delay is the only possibility to exclude dupe of color logs bug, so if u wanna lightwood - deal with it :P