It does involve a protected spinner but using a mechanism which has a fail state of open. Essentially once it is set at the start of a battle if it loses power, either due to damage or being manually disabled, the mechanics of the system result in it immediately being in the open position leaving the weapon accesable.
As for the weight (which is actually around 90kg, I made a typo in the original post), the numbers behind the system already give it as much power at the tip of the blade as Carbide had in the previous series.
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