Medith
Not every chassis is the same. They all have certain tolerences for manufacturing, and those are tighter on some brands than others. This may not always be a spec that is checked by the manufacturers QC since it isn't all that important for them. The trick is that my Skid plates require the countersinks of the chassis to be machined within a certain range of depth. I have purchased and checked several chassis from each manufacturer to develope this "range". If the plate bows up when you tighten the screws it would generally mean the countersinks are to deep in the chassis. To fix this problem "DON'T TIGHTEN THE SCREWS SO HARD". They don't need to be wrenched down super tight. You could also use a little shoe goo in the countersinks between the plate and chassis and intall the plate with the screw just snugged up. Then when it is dry wrench it down a bit.