I flew the Fokker 100 and they just had a switch. Unlikely for that to fall out isn't it.
I used to sit on the brakes when towing Fokker 100s and we had a lot of problems. The steering lock out switch was on the ground power panel, and when you shut the panel, the switch was moved to the normal position.
On the tow down the hill from the hangars at ARN there was a bump in the taxyway, and the panel swung shut and disconnected me from the tug. It needed a Heath Robinson panel lock open device to keep the steering lock out switch open for towing!
And then a few weeks later a helpful tug driver closed the panel before we set off, and the shear pins went again.
Give me a TBL any time.