A skillcheck of cr.sm.bl.to is involved. I got a tm to 95/199 while grinding down a mail coif, but I don't know what higher skill results in - maybe more filings per pound, or faster grinding. Tetrikitty 15:56, 25 August 2015 (UTC)
I got 20 handfuls of filings vs 13 handfuls for a lump (~40 lb), so it gives more filings per lb. --Frazyl 19:14, 25 August 2015 (UTC)
--Frazyl 07:30, 25 August 2015 (UTC)
So except for the lumps it seems to be giving about half the lb in handfuls.
--Frazyl 07:57, 25 August 2015 (UTC)
I got 20 handfuls of filings for the lump, the 12 and 13 handfuls were from someone else. I'm therefore guessing that how much you get from grinding is based on some skill, something like cr.sm.bl.
My cr.sm.bl.tools bonus is 229, weapons 185 and armour 147.
An item made from wood and iron did not work.
--Frazyl 08:23, 25 August 2015 (UTC)