Dual Arm Mainsheet Jammer - Compact

Compact Dual Arm Mainsheet Jammer

Designed for dinghies and keelboats that require centralised control of both the mainsheet and an additional control line, this Compact Dual Arm Mainsheet Jammer provides efficient, ergonomic line management in a low-profile package. The dual arm arrangement allows both controls to remain within easy reach of the mainsheet trimmer for faster and more efficient adjustments.

Built around Allen's cold-forged bearing system, the jammer delivers smooth rotation while preventing lateral arm movement. The main arm is fitted with a medium aluminium ball bearing cam cleat with Mega Pro-Lead, while the lower arm features a small aluminium ball bearing cam cleat with Mega Pro-Lead and integrated sheaves to guide the control line cleanly into the cleat.

Key Features:

• Compact dual arm mainsheet jammer design
• Ideal for mainsheet and secondary control lines such as vangs
• Cold-forged bearing system for smooth rotation
• Ball-locating groove reduces lateral arm movement
• Adjustable rotation settings of 180°, 220°, or 360°
• Optimised arm angles for easy cleating and uncleating
• Medium aluminium ball bearing cam cleat with Mega Pro-Lead on the main arm
• Small aluminium ball bearing cam cleat with Mega Pro-Lead on the lower arm
• Integrated sheaves on the lower arm for efficient rope routing
• Available with or without a 60mm Pro-Ratchet Block
• Ideal for racing and performance sailing applications