When the linchpin comes out on his side, there'll be a jerk, I tell you!
I will try to be brave, ma'am; but I really did try to put the linchpin back.
If an axle had broken or a linchpin loosened the race would have been lost.
A linchpin had fallen out, and permitted one of the wheels to slide off.
Linchpin, linsh′pin, n. a pin used to keep the wheel of a carriage on the ...