'Who do these things?' Dan asked, and straightened his back at the bench as he turned the schooner end-for-end in the vice to get at her counter.
'Them which don't wish other men to work no better nor quicker than they do,' growled Mr Springett. 'Don't pinch her so hard in the vice, Mus' Dan. Put a piece o' rag in the jaws, or you'll bruise her.
This from "Rewards and Fairies" by Kipling.
I do not understand what the line below means.
and straightened his back at the bench as he turned the schooner end-for-end in the vice to get at her counter.
What does "turned the schooner end-for-end" mean?
What does "to get at her counter" mean? Is there any counter on the schooner?