Admiral 19A15. 7LP4 Shield Placement.

[Dangler]

Since I retired back in March, I've had some time to work on this Admiral that I've had for over 25 years. It has the 19A1 chassis, which I'm in the process of replacing the electrolytics and out of tolerance resistors.
Going through the Rider's service manual, it mentions a corrugated cardboard spacer between the CRT and the aluminum shield that is missing from mine.
Anyone know what the spacing should be?
Depending on the gap, I figured on using thin weather strip as a spacer on the inside of the shield. Thank's for the help.