De Westermolen, Kollumerpomp of the upright shaft. At the bottom of the upright shaft is the "crown wheel", which has 41 cogs, drives a gearwheel with 42 cogs on the axle of the Archimedes' screw. The axle of the Archimedes' screw is diameter. The screw is diameter . It is inclined at 16.7°. Each revolution of the screw lifts of water. The Archimedes' screw that pumped water into the polder has been removed. "De Westermolen" is open on Friday mornings. It is also open on Saturday mornings if there is enough wind to work the mill. De Westermolen, Kollumerpomp De Westermolen is a
Tochmaland, Kollum containing an electrically driven Archimedes' screw was erected next to the mill. A proposal to demolish the mill was rejected by the mayor of the gemeente Kollumerland en Nieuwkruisland. 0n 30 December 1948, the mill was purchased by the gemeente. Restorations were undertaken in 1949, 1963 and 1983. since 1995, an electric motor has been installed in "Tochmaland" to drive its Archimedes' screw, and the installation in the brick shed demolished. "Tochmaland" is what the Dutch describe as an "Grondzeiler". It is a two-storey smock mill on a single-storey base. There is no stage, the sails reaching down almost to