For the first time in many Savage Worlds campaigns over several years, a player has the "McGyver" Edge.
The first benefit of the Edge is clear cut: when rolling Repair on the "hyperspace torque converter", the PC suffers no penalty for improvising tools and fixes.
The second benefit is the ability to build one-shot widgets, gizmos, and whatchamacallits to suit the need of the moment. Some of these "moments" can be literally life-saving, so the McGyver gizmo can be very significant to the plot/play.
Such a significant act should require a dice roll, but against what trait? Repair? Smarts? Something else?
Nowhere in the book can we find a hint. Searching and wading through endless threads at the company's forum brings no joy. I'm hoping the good folk at StackExchange can provide a crisp and clear answer.
We don't care which edition of "Savage Worlds" rules may reveal the secret. If it is a newer version than we're using, the answer is still likely to be useable, or at least provide guidance.