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11,577 Posts
All I can suggest is trial and error. Scan the decal, and then print out on regular paper adjusting the scale as you go until the new size works. Just remember what the percentage is when you get there. Also remember to switch it to photo quality paper when you actually print the decals.. What may work for one set may not work for the next, as I'm sure you know scale is primarily to define the chassis size. Tweaking of the reduction will be required but at least you'll have a good starting point for the next time.
