Installing DRS6ANXT NXT

[Buzzard11]

Hi trying replace old Furuno Open Array Radar with DRS6ANXT NXT. The old radar had nuts on top to tighten to spot. The new DRS6ANXT NXT has nut to tighten under the top. I have a 2002 Cabo 35 that has vinyl on back side if top and no way to get in there for nuts. How do I install, are there blind fasteners that I can use?

 

[Chevz7176]

This is how I installed my newer Furuno radar . All the hole matched right up