I am using eccentric spacer nuts to create a tight fit between wheels and a rail of a linear sliding mechanism. (Expand the product description in the link to see a picture of it in use).
They aren't actually nuts: they have no thread. But the hexagonal part of its exterior allows the spacer's off-centre hole to be adjusted with respect to the external cylindrical section with a spanner, thereby positioning a shaft going through it relative to the structure holding them.
Are there alternative mechanisms for adjusting the distance between opposite wheels? They are very effective, but are £2 per piece from the UK, and it really adds up. They only seem to be sold by suppliers of the open-rail and v-slot systems, so I'm hoping, either:
- These accent rich spacer nuts are known as something else in other systems, at a lower price, or...
- There are other mechanisms that achieve the same.