Rotate a libary part inserted onto an existing part?

Hello all,

I'm trying to get thru some of the SW lessons within the program itself and I'm stuck on the last page of the one with the knob / keyhole on the Fillets tutorial.  When I bring in the keyhole library part onto the knob, it has the keyhole not aligned vertically with the knob.  The tutorial doesn't mention how to align the library part, only how to bring it on the part and center it up with the reference edge dialog box.  I tried editing the keyhole sketch itself but it gives the error on the screenshot below.  If I unlink the libary part, I can then use relations to keep the keyhole parallel to the knob but then I cannot re-link it back into the part.  I appreciate any help.  Thanks.

Followup: I tried this again at lunch and notice that if I select the back face and then choose "Normal To" prior to dropping the keyhole on part, it appears to somehow put it aligned vertically with the keyway at top.