Mine were shaking a little from road bounce and air traveling down the highway....seemed like everytime i went fishing one of the stainless screws would break. I cured that by taking a,10X10 piece of aluminum plate 3/16 thick and welding a piece of 1/4 aluminum scrap in the center.....then i put some beads of F26 adhesive on bottom side and mounted with a lot of stainless hex head screws. Then i drilled and tapped two holes for the rodholder and fastend down with stainless bolts....solid as a rock. Did all four rod holders this way. Over kill i know but it works.
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