English to Russian Tech/Engineering Mechanics / Mech Engineering parts of a watermill (in an American novel set in 1702)

Slaughter made for the watermill. This time he dared a glance to judge Matthew's progress, and with a bound he was up the mill's three stone steps. He whirled around, facing his pursuer. Matthew saw the powderhorn come out of the bag. Saw Slaughter's arm moving in a blur to seat the patch and ball. Saw the gleam of the ramrod as it slid from the socket.
Matthew felt vines grab at his ankles. He tore free, and was racing toward the steps when he saw the ramrod go down into the barrel.
Ramrod out. Powder in the flashpan. Flashpan snapped shut.
I'm not going to get there , he thought.
Gun swiveling toward him. Thumb on striker.
Striker going back.
Firing position.
The gun was in Matthew's face, and he saw the striker fall as he was jumping forward up the steps, pushing with every ounce of strength in his legs, the knife in his hand already streaking out.

He heard the click of the flint and the hiss of the sparks. Smoke enveloped him, but before the gun fired and the ball came out the pistol was deflected, because Matthew had chopped an arm into Slaughter's wrist and stabbed at his ribs. But just that fast Slaughter had already sideslipped; he caught Matthew's arm to prevent the knife from biting, and their backward momentum took them crashing through the door.
They tumbled together amid the mill's inner workings. The rotation of the ***pit wheel***, the wallower and the great spur wheel made a noise like muffled thunder. Matthew and Slaughter fell across a planked floor thick with yellow dust and the decay of thousands of dead leaves blown in through the glassless windows. Matthew had not let go of the knife, and as he rolled away from Slaughter he took it with him.