Original Makita counter weight (part no. 313121-2) — a direct replacement counterbalance used in the JR3070CT series reciprocating saws. This genuine Makita internal weight mounts to the crank/rod assembly inside the gear housing and restores the tool’s designed balance so the AVT anti-vibration mechanism performs correctly.
Fits: JR3070CT and related JR3070CT variants (including JR3070CTZ and Type 1–3 listings), shown in the official parts breakdowns as part 313121-2.
Details: metal counterweight manufactured to the original specification, sold individually as part number 313121-2 for straightforward replacement — no modification to the saw required when installed in the correct location within the gear housing. Keep this genuine Makita replacement on hand when repairing AVT-equipped reciprocating saws and other Makita parts to restore smooth, low-vibration operation.
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