An essential part for hauling in the herring nets are the 'geestrollen' (ghost rollers):
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During my visit two weeks ago, I measured the parts. These were stored in the forecastle. I hadn't noticed them during my previous visits because they were never hung there. And I haven't (yet) come across any drawings with measurements. One of the volunteers had a photo of the moment they were replacing one of the side rollers.
The two side rollers are also specific to the Balder and possibly to Vlaardingen. Until now, I'd only come across images showing just the large horizontal roller.
Some details:
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The beams are attached to the outside of the bulwark.
A: The base of the beams has a lip that is inserted into a flat bracket.
B: A threaded rod goes through a hole in the bulwark plate and is secured with a nut on the inside.
C: Planks can be placed on the bulwark on either side of the beams. This prevents much of the catch from jumping back during the emptying of the nets. They slide into a slot on the side of the side beam and, with the pin, into a hole in the handrail.
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A: The bracket where the lip fits.
B: The hole through which the threaded rod passes.
The 'geestrollen' are installed:
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There is generally only one, on the side where the nets are hauled in. One has been custom-made for each side.
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The lips on the underside are just visible.
Planks can be placed on the bulwark on either side and between the beams:
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On the starboard side, also the plank in the middle. On the port side, the situation as it is during the hauling in of the catch.
Some more details on the port side interior:
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The two nuts on the threaded rods of the beams and the pins on the side planks that I insert into the holes in the handrail.
Then this center section is finished. It's ready to fish...

Regards, Peter