It would be really helpful if you know the manufacturer and model number of your slide-out mechanism. I doubt you have the same mechanism as I do, but I'll bet the adjustment process is similar.
On mine, the slide-out rails are held up by four metal posts (constructed of channel steel with a bottom bracket) that have adjustment slots with screws in them. There are two screws per leg. You have to have a way to jack up the mechanism while you are adjusting/tightening the screws.
I am not trying to judge your fix-it skills, but this is one for someone who considers himself to be quite proficient with jacks, bracing and nuts and bolts in tight places. You will need, at minimum, one (and possibly two) two or four ton jacks. (Larger ones will not fit in the spaces you have to work in. I prefer the two-ton size.) You need to get the slide-out rails stable by applying just enough jack pressure to be sure they will not slide down when you loosen the bolts holding things up. When you have the offending bolts loose enough, you need to jack up the appropriate rail until you have the height you need. (I use the paint markings on the outside of the coach for alignment.) I typically work one corner of the slide-out at a time. I limit any one move to 1/4 inch to avoid any stressing of the assembly. But, it sounds like you only need to move one corner up about 1/8 to 3/16 of an inch to stop crimping your seal.
You will not find any instructions on this. The manufacturers consider this too risky for an owner to do themselves. So, you are left to those of us who have had to learn from trial and error how all this works.
And you also have to know in your heart that you have to be very very careful when you are messing around with one of these slides. The weight and balance involved, especially when they are in the extended position, could cause them to get loose and pop up inside the coach which could have disastrous consequences if you are in the way. I kept my slide-out fully braced inside and jacked up from the outside (with a floor jack and 4x4 beams) when I was working on it in the extended position.
Again, if you can find out the name of the manufacturer and model number it would be a great help.
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2003 Beaver Patriot
2014 Honda CRV Toad
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