Light saber

This article is about Springer's helicopter-blade weapon. For an elegant weapon for a more civilized age, see lightsaber.

"I think George Lucas gonna sue somebody!"

When he transforms from helicopter to robot mode, Springer's rotor blade also transforms to become a light saber.

Fiction

In robot mode Springer was armed with a light saber capable of cutting through concrete. Springer's Universe profile

You know, as opposed to a Heavy Saber...

The Transformers, Springer's helicopter blades could fold up to form a light saber, according to his instructions and packaging bio.

This toy was reissued in 1991 as part of the European/Australian Classics line.

While Springer being armed with a light saber is not particularly surprising given that The Transformers: The Movie was marketed as "conceived in the epic tradition of Star Wars", this seems like a particularly egregious bit of trademark baiting from Hasbro given that Lucasfilm are particularly protective over the lightsaber.
The Dreamwave More than Meets the Eye writers sidestepped the issue entirely by replacing Springer's light saber with a more generic energy saber.