bushing

Urethane bushings prevent sideways deflection of the arm better than rubber stock bushings, helping align of the rest of the suspension system’s higher-performance components and increasing durability during more extreme use.

If a piece of brass tubing, an old bushing or a cored piece is at hand, a part of the work is already done.

The type shown at A employs a molded porcelain as an insulator, while that depicted at B uses a bushing of mica.

In assembling the battery, the cover is placed over the post, and the cell connector is burned to both post and bushing.

The rubber bushing is grooved horizontally to increase the length of the sealing surface.

This will make a perfectly tight seal, provided that you screw the bushing up tight.