The inboard is set by positioning the collar on the sleeve.
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Sculls:
- Measure the spread of the boat (distance between the pins that hold the oarlocks).
- Take half of this dimension and add 6–8 cm to get a reasonable inboard dimension.
- Measure this distance from the end of the handle and position the collars at that point.
- Tighten the fasteners evenly and firmly.
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Sweeps:
- Measure the spread of the boat (horizontal distance from the center of the boat to the center of the pin that holds the oarlock).
- Add 29–31 cm to this dimension to get a reasonable inboard dimension.
- Measure this distance from the end of the handle and position the collars at that point.
- Tighten the fasteners evenly and firmly.
Here is a link to Oar How to Videos and Information.