McCoy Series 21

I got a pair of these .19s a while back, both missing some parts with some damaged parts also.  I had enough good parts to put a complete engine together but I'm missing the exhaust baffle link.  



Does anyone have one they can measure for me, and a picture would be nice?  I won't be hard to make one from music wire.
I'm not sure whether the baffle should fully close at idle or if it needs to stay open a little.  On other engines I notice there is sometimes a small hole in the baffle to avoid fully choking it off- no hole in this one.  The throttle lever can be moved on the barrel to alter the baffle position.

Cheers.
Rod.