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Hi Willy,, some time ago I have done it this way.http://www.modelenginemaker.com/index.php/topic,4060.msg74852.html#msg74852Only to show an other possibility of getting a similar result, but all from steel.
K&S brass tubing goes down to 1/16" OD [ 0.0625" OD x 0.014" wall & [despite multiple annealing] this is a difficult tube size to bend without collapse
Hi Achim , thanks for the pics and there was quite a lot of work there And of course it is all metal !! I have now cut the slot and inserted the perspex slots. .. Hi Chris , this is one way of doing this using modern technology and i hope it will look ok when it is painted...It might be possible to cut a similar ring from steel and bend that to insert it like the perspex one. one can do it with piston rings of course..Willy