O.K. Bloke i'll talk ya through it,Click on Mick-De's post above of the prox catalog link,when the screen loads scroll to the bottom,there it is right in front of ya, Technical.pdf,click on that, it,s 9.5 meg to down load but takes less than a minute,when its fully downloaded you will see in the middle bottom of the screen,con rod chart click on that,there ya go