Thanks for the info of D bit
I have made a few with a Deckel so
http://www.dialog5.com/OtherDownloads/AnleitungDeckelSOE.pdf
in here you will find more examples in
unfortunately in German
groet Marcel
here is the engine
The James Beggs Bottle Engine kit has been featured in a series of articles written by Mr Anthony Mount in the Model Engineer Magazine starting in Vol. 197, No. 4287, 24th Nov - 7th Dec 2008 and offers an illustrated guide to assist machining and building the model...