This is a product-tested roller bearing that can be used on a linear tonearm. It has very good smoothness and is suitable for using the straight line of the blade as a guide.

The price linked is just for the two roller bearings, the last picture is an example of the finished product and the tonearm is not included in the price.

DIY production is a free creative work, so the price of the link does not include post-production guidance. Interested friends can try to buy and make their own designs.