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Troll-Master AR-1021 Universal Downrigger Swivel Base

Price: $125.00


  • SKUTRO AR-1021
  • Part #TRO-AR-1021

Optional Accessories

In Stock
- +

Adjustable Swivel Base

Seahorse® Swivel Base rotates a complete 360° circle of rotation and locks in 36 different positions allowing the user to pick virtually any angle for the downrigger. This feature provides effortless re-positioning of the downrigger boom inboard for rigging, docking or towing.

  • Heavy Duty design
  • Made to withstand weather elements UV and corrosion.
  • Easy one finger lock operation
  • Designed to work with all Seahorse®, Penn® and Cannon® downriggers. (Just swap the two round plates included to the one with the correct screw hole positions )

The rectangular mounting plate kit used on the Penn and Seahorse downriggers is needed. If you already have the plate and mounting hardware and wish to re-use them, just leave the plate kit option below unchecked. If you don't have the plate and mounting hardware, check it off and both items will add to the cart together.

The rectangular mounting plate used on the Penn downriggers is NOT required for Canon downriggers, so leave the optional box below unchecked.

The adjustable downrigger base is designed to accept Penn© or Cannon© downrigger mounting plates. The base rotates a complete 360° and locks in 36 different positions allowing you to pick virtually any angle for your downrigger. This feature provides effortless re-positioning of the downrigger boom inboard for rigging, docking, or trailering. The fact that this swivel base allows for installation of two leading downrigger manufacturers provides fishermen with the ability to switch from manual to electric or from one brand to another without any additional investments or re-rigging efforts.

Installation Instructions

Carefully select the location of the swivel base on your boat. Make sure that you have enough swing clearance for proper operation. Use the swivel base cover as a template to mark the holes to be drilled. Make sure that the hole pattern is positioned so that you will have enough clearance and reach to install the mounting hardware (provided).

The swivel base comes pre-assembled. Note the oval shaped hole on the swivel base top. The oval hole provides access to each of the four mounting screws.

  1. Unlock the base by turning the finned lock release ring counter-clockwise.
  2. Turn the swivel top until the oval mounting hole is above the mounting screw.
  3. Secure the screw without over tightening.

Repeat steps 1-3 for all remaining screws.
After the base is installed select appropriate cover plate and the mounting plate for your downrigger.
Note: The mounting plate bolts should not exceed 1/2 inch depth into the swivel base top.

  • Use the cover plate with square 2 ½ x 2 ½ inch mounting pattern for Cannon© downrigger installation.
  • Use the cover plate with square 2 ⅜ x 3 ½ inch mounting pattern for Penn© downrigger installation.


Troll-Master Inc warrants to the original purchaser any defect in material or workmanship for the period of 10 years since the date of the original retail purchase. Troll Master Inc will either repair or replace the product free of charge.

About Troll-Master

Our Mission
Troll-Master Inc. is committed to the development and manufacturing of the high quality parts and accessories for the fishing industry. Our goal is to deliver a good product at a competitive price while maintaining the highest quality standards.

Our Team
Troll-Master’s Team consists of professional engineers, tournament winning captains, fishing enthusiasts and manufacturing experts. Our R&D works in conjunction with real customers across the country utilizing hands on experience and cutting edge technology to design our products.

Our Products
All our products come with a 10 year manufacturer’s warranty. There are no conditions, no fine print and no limitations. We simply stand behind our products and will either replace or repair it in case of any breakdown.
We are confident in the quality of the products, functional design and the materials used to produce them.

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12/21/2023 Got it! Its perfect. Thank you so much. It was just on a whim that I even searched for this part. Hard to believe that I could get a reel part for a reel that is 30 plus years old. Thanks again,
Todd M
1/16/2024 Comprehensive parts list, easy to order, and prompt service. I will definitely use them again.
Lin R.
1/4/2024 Quite a few years doing business with great folks. Simply the best. Thanks for your commitment to the business 👍