The window is mounted to the underside of the playfield with small rubbers in between that allow you to raise and lower it to make sure it's totally level. If you loosen those all you'll be able to adjust the window in the plane of the playfield, to make sure the gap is consistent all the way around.

If you lift the playfield, grab a socket, and check those out, I think you'll find it is pretty easy to adjust.

Tom

When I replaced my window, I had to replace all of the rubber washers that were on the bolts since the old ones were long rotted away. Can you add a set of these to the bolts to sit between the playfield and the window to reduce that gap?

http://www.marcospecialties.com/pinball-parts/38-0316B

Even if the window is perfectly level, if the gap between the window and playfield is just the right size, it can still catch a slow rolling ball. I wonder if there's some variation in this gap from Creature to Creature?

You could try buying this and laying it over the playfield: http://bayareaamusements.com/Merchant2/merchant.mvc?Store_Code=BAA&Screen=PROD&Product_Code=GS-CFTBL-PF-PROTECTOR

It would get rid of the gap, but it would probably play a little different, and rollover switches may need adjusting.

Plastic and wood shrink and expand differently as a result of temperature moisture and time

It happens on mine too. The best way I have found to minimize the ball rolling in the cracks is to have the lower part of the window level with the playfield, but have the top of the window slightly higher than the playfield, and I mean slightly. The ball will kinda "hop" over the gap, so you dont cause wear to the edge of your playfield.

I also have had my window do this to a slow moving ball. Will be following this thread to learn more. Thanks for the links!

Mine does same with slow moving ball…any suggestions?

Do you find a fix?

My CFTBL does exactly what you described

Bumping this. Any solutions?