The Double Compass from VMC is a helpful test tool for determining the wall thickness.

In the search for performance, it often happens that you rework your Racing Cylinder mechanically. The remaining wall thickness must always be taken into account in order to avoid an unwanted breakthrough.

Without an exact measuring device, however, it is often only possible to make assumptions about these wall thicknesses. Which is why you don't venture to the limits of what is possible when machining.

The VMC tool allows you to keep a close eye on the wall thickness. Highly recommended, especially when machining the outlet.