Sawbot

Sawbots are close to spinners because they do have a spinning weapon.

But contrarly to spinners or drums that features bars/discs/tribars, a sawbot's weapon is just (as the name implies) a saw or circular weapon (single component) attached to a motor. Middleweight and heavyweights can have multiple saws.

Sawbots suck in Stock RA2, but they can be very efficient in DSL.

Ninja, BOT-204 (and their DSL counterparts) and Spinner from the West are sawbots, but Ripblade isn't one because it has teeth on a disc, and this in both DSL and Stock.

Sawbots do generally less damage by hit than classical bar/disc spinners and have generally more fragile weapons, but they do continuous damage, have lighter weapons and their weapons can't be blocked. Also, if it loses one of it's saws, a sawbot won't wobble like a normal spinner would.

Your sawbot can be either damage-orientated (use classic sawblades or Backlash discs) or strength-orientated (best choice is WhirlWep discs but you can also use chewblade saws). Damage-orientated sawbots are extremely powerful but have vulnerable weapons, and vice versa for strength-orientated ones.

A TWM3R is a good choice for a classic sawblade, but for heavier discs you'd be better with stronger motors.