'fraid I just don't know Bob. Think you'll have to call 'em or send an email (if they answer stuff).
Looking at some other sites for other makes, I'd say possibly 'no', they prefer to sell whole sub-assemblies, but B&S seemed to break things down better than some others.
My experience with after-sales on garden stuff - mowers, strimmers, chainsaws, hedge trimmers etc - has been a bit 'some and some'.
On one occasion I got so p****ed off I rang the manufacturers of a ride-on mower clutch after discovering it was actually made in Wisconsin and got them to send me what the locals here said would take 6 weeks at best and cost a fortune (300€+). It took 3 days and cost 70$US plus a bit of postage . . . That tells me something! Not sure what, except that Customer Service and a Service Economy still existed at that time in the good 'ole US of A. It's not always easy to beat the system of distributors and protected partitioned markets, designed to screw us (wash my mouth out with soap, sorry, I meant 'improve the customer experience').
Maybe you'll be as lucky. But in whichever case, better than buying a whole new machine for the lovely daughter I'd have thought!