Thanks Michael. Yes it makes perfect sense to me...now! Without a catcher it was difficult to envisage how it engaged. I was clumsily trying to use modern Victa & Rover catchers with 0% success. Now, thanks to your pics, all has been revealed and I'll know what to look out for in a catcher. With any luck I'll find one out on the verge

Thanks very much for taking the time to capture & upload the pics Michael. Your efforts are very much appreciated indeed. You've no doubt accumulated some good "Karma Credits" here. Thanks again.
Kind regards - Peter.