Just mask the reel background on your image,with a solid colour,off grey is best,then size your reel symbols over them,right click the reel open the properties,then right click your reel again and select create overlay,the reel will disappear and become the background colour you chose to mask the window with.
Go to the properties window and were it says overlay,click overlay then a picture of your overlay will appear in the properties box,right click it select transparency,then select set from centre,it will then show your reel again but it will have an overlay so it looks like they are behind the glass.
Thanks, but I already do that. The problem I had, was with the particular cabinet I tested with. The angle of the 3rd reel window was too noticeable when you put the reels behind it, in fact there was a gap top left and bottom right. (straight reel in a crooked window)
Anyway. I will carry on with what I started yesterday, and see if I can get this finished for weekend.