Attwood Marine Knob Spring Washer, For Fold-Down Pole Lights

Overview

The Attwood Marine 1003166 is a replacement spring washer for select fold-down pole light knob assemblies. It is the small hardware piece that sits under the knob on certain Attwood navigation light bases, so this is a service part for the mounting hardware rather than the light pole, lens, or lamp.

On boats that use a turning-knob fold-down light, this washer matters because it adds tension at the knob and helps the base tighten and hold its set position more consistently. It is a practical fix when the original washer has gone missing during maintenance or when the knob no longer clamps the base the way it should.

This part makes sense when the rest of the light base is still in good shape and only the washer needs to be replaced. It is commonly the kind of small piece that gets lost during seasonal service, pole removal, or light base repair on stern light and bimini-mounted light setups.

Key features

• Replacement spring washer for select Attwood fold-down pole light knob assemblies
• Used in turning-knob fold-down navigation light hardware rather than the light pole or lamp itself
• Adds tension under the knob so the hardware can tighten and hold position more consistently
• Useful when the original washer is missing, worn, or lost during light service
• Lets you repair a small but important part of the base hardware without changing the full light assembly

Compatibility and fit

This washer is associated with select Attwood fold-down pole light hardware that uses a turning knob. It is not a universal washer for seat mounts or general deck hardware, and it is not a substitute for the base, pole, globe, or knob itself. Matching it to the hardware already on the boat is the safest way to confirm fit, especially on older stern light and bimini-top light installations where similar bases can use different small parts.

This is a good match for owners who already know the base style on the boat and need the missing washer to get the hardware working again. It suits routine maintenance on pontoons, runabouts, and cruising boats where replacing one small lost part is easier than changing the full navigation light base.

Installation and setup

Installation is straightforward once the knob hardware is apart: replace the old washer in the same position in the stack-up and reassemble the fold-down base. Because this is a small part in an exposed area, it is worth checking the knob, threads, and base surfaces at the same time so the light still folds and locks down cleanly after reassembly.