If you are referring to the spacer between the end of the shaft and the blade then it broke because the unit struck something and the spacer (also referred to as the blade adapter) broke saving damage to the engine itself. This is a normal occurrence and can be replaced. Check the blade for damage or bending as this will cause the mower to run off balance causing greater damage. Also, I have seen the blade adapter break as well as the flywheel key keeping the unit from starting.
No.
to be honest you go on eBay and buy a new one
Yes, you can. TBI stands for Throttle Body Injection, and a spacer can be used provided you have the clearance for it.
No.
clean out or replace the throttle body spacer...
between torque converter and engine
Throttle body spacer works by regulating the flow of air into the engine of the vehicle. It allows more air than is required into the system so that the engine does not have to work too hard to correct the combustion chamber.
the spacer lowers the front axle to alow to install the large m100 6.3 engine.
Where can you buy a spacer
There is one way that one can appropriately use a spacer when administering asthma medications. A spacer is used by attaching the spacer to the inhaler.
You must remove the BOTTOM bolt from the engine mount on the front of the engine, not on the body. The engine will still be held in place. When you remove the belt the spacer will drop out allowing the belt to pass through. The tension is released as usual. Actually pretty easy once you know about the spacer.
Remove the lower bolt on the engine mount housing, then remove the spacer. The belt will slip right through.