I don't think there is any adjustment that will solve this, most older slide outs are only adjustable at the bottom and the top stays tight due to the weight of the slide out. Are both front and back edges the same? Use a 6 ft level or other straight edge to determine if the slide out wall or the main wall is bowed in some way.
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Larry Day, Texas Baptist Men volunteer
'13 Silverado LT 3500HD D/A CCSB 2wd, custom RKI bed
'19 Starcraft Telluride 292RLS
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