I tested a number of different internals and found that a baffle worked as well or better then a internal tank.
WAY back in the stone ages I sent a few tanks to Dick Jones to try some out with on his larger engines too. We gained more information from that as well.
I dont have a picture here but let me look around at home and see what I can find.
fixed the tank after putting some pressure in it, found a small pin hole in the bottom corner,
got the gun out fluxed , soldered repressured all good. I've made tanks in the past , just tried something
different. thanks for the help. Chris