Fly the Team Iceshanty Flag! Iceshanty Proshop
What about mounting it to the side of a plastic milk crate? No worries about damaging your new sled and you can move/remove it as needed. A five gallon bucket, plano lure boxes, LP cylinders, etc would fit inside the crate too.
Fender washers tend to reduce stress with bolts through plastic
if cracking is happening, use back pressure on the bit before it breaks thru like we do on some ice augers. also add tape on both sides first. use smaller bits and work up to your size as you go. same as you would cutting in metal.otherwise just put them into a bucket with the bottom off from another bucket cut down to fit upsdie down and into the inside bottom of the bucket i am using to hold my rods and use a butterfy/paddle bit to make holes to keep your rods spaced apart. the key to this is to have your cranks facing upwords when setting them in to use the least amount of floor space. you can hand wind the spool so the sit that way.i use the rod socks to keep the tops from tangles.i use the rest of the cut up bucket as a bucket extender to also proect the tops from getting hit on things. you can take it out if you don't glue it and use it for a rod holder to dead stick fish.you could take a swim noodle or pipe insulator and push it over the lip of the top of the bucket and put slits and a hole facing downwords at the end of the slit in it to push the rod tips into to keep them from tangeling aslo. berkley makes some thing like it for their rod holders made out of foam and hard plastic.
I guess I do not know what a fender washer is