Cylinder shim / 1mm RRD aluminum base gasket for MBK 51 / av10 motobecane

1mm shim for cylinder base. Made of high quality machined aluminum. Made in Europe for RRD. Original shape to be adaptable to all cylinders. Allows an increase in the diagrams for fitting long stroke crankshafts (in combination with base gaskets). Manufactured in small series in quality materials, which explains the price a little high for this small part.