This compass is a versatile tool, which can be used with many drawing accessories.

Construction: 

The model uses an M8 bolt and nut to hold the arms in the proper position. The M6 bolts are used to tight the drawing tool into position. No glue is needed and the bolt length is also not important. In the model, 4 pcs M6x20 and 1pcs M8x25 hexagonal bolt and nut are used.