You got SPARK EXTRACTOR!
A spark extractor is a device invented by Cryotek that is used for pulling a Transformer's spark out of its mechanical body. This process can be accomplished even against the will of the target Transformer (as was, in fact, the norm). Once removed from its body, a Transformer's spark is more or less helpless.
When an extractor is near a Transformer and activated, even before the spark emerges, the Transformer often appears to be stunned or dazed such that they find it difficult to resist. The extraction itself is quite fast, taking well under thirty Earth-seconds in most cases. Extractors are therefore quite effective as weapons, requiring only that the victim be momentarily immobilized in order for the extractor to do its work.
Fiction
The Wreckers comics
The technology fell into Megatron's hands when he returned to Cybertron from the Beast Wars and briefly worked with Cryotek.
Beast Machines cartoon
I'LL SWALLOW YOUR SOUL!
Spark extractors were used frequently, such as on Blackarachnia in several occasions. After interfacing with the Oracle, Megatron's own disembodied spark also had the ability to remove the sparks of living Transformers even without the technological aid of an extractor.