A villager has threshed his grain and needs it ground into flour. Under the usual manorial custom, what must he do?

Explanation

Milling was a profitable monopoly, so the lord built the mill, required his tenants to use it and kept a share of what passed through as his price, which is why hand mills were so often seized and broken when they were found. The church answer fails because the parish took its own share of the harvest and had no part in running the village's milling.