How to Set Up a RAM Pin-Lock Marine Mount for Fish Finders

Quick Answer

To set up a RAM Pin-Lock Marine Mount for your fish finder, attach the round base to your boat, connect the double socket arm, secure the rectangular base to your device's gimbal bracket, and lock it with the Pin-Lock security nut and key knob.

Step-by-Step Setup Guide

1. Attach the Round Base: Position the 3.68" round base on your chosen mounting surface. Use the pre-drilled holes (two at 180° or three at 120°) as a guide to mark drill points. Use marine-grade stainless steel screws (not included) and sealant to prevent water intrusion. Tighten firmly but avoid overtightening that could crack the base. Common mistake: using the wrong hole pattern for your surface. Always match the pattern that gives the most secure contact without overhanging the edge.
2. Connect the Double Socket Arm: Insert the short double socket arm's ball end into the round base's socket. Tighten the knob until the arm holds its position under light pressure. Do not fully tighten yet—you will adjust the angle after attaching the fish finder. Checkpoint: ensure the arm can pivot freely but does not sag under its own weight. If it droops, tighten the knob slightly.
3. Secure the Rectangular Base to Your Fish Finder: Align the 11" x 3" rectangular base with your fish finder's gimbal bracket. Insert the supplied Pin-Lock security nut through the bracket and base, then thread the key knob onto it. Tighten by hand until snug, then use the key to lock it. Do not use tools—overtightening can strip the plastic components. Common mistake: forgetting to insert the security nut before attaching the key knob. If you cannot lock it, disassemble and start over.
4. Attach the Fish Finder to the Arm: Place the rectangular base's ball end into the other socket of the double socket arm. Adjust the fish finder to your preferred viewing angle, then tighten the arm's knob firmly. Test the movement—the gimbal knob should allow tilt and swivel, while the Pin-Lock keeps the bracket locked to the base. Checkpoint: after tightening, try to rotate the fish finder by hand. If the display moves, tighten the arm knob more. If the gimbal knob is too stiff, loosen it slightly.
5. Final Lock and Test: Use the Pin-Lock key to fully engage the lock on the key knob. Give the fish finder a gentle tug to confirm it is secure. Then run a short on-water test to check for vibration or loosening under engine power. Re-tighten if needed. Common mistake: not testing under vibration. A mount that feels tight at the dock may loosen after a few minutes of boating.

Product Details

• RAM® Pin-Lock™ Marine Electronic Mount with Gimbal Knob - D Size Short: The RAM-SG-D-111U-C consists of a 3.68" diameter round base, short length double socket arm, 11" x 3" rectangular base, and a RAM mixed combination Pin-Lock security nut/knob and key knob for gimbal brackets. The short double socket arm keeps your fish finder close to the mounting surface, reducing leverage and vibration, while the Pin-Lock deters theft without blocking daily tilt adjustments.