specter, does the shaft that goes into the backplate slide in and out of the engine? or is it mounted inside and very rigid.
If it slides in and out, this is a not a good idea as the shaft may fly out as you turn a corner and produce large air-leak in the engine. It's it's sloid (most are), you've just created a homeade "Yank Eliminator" (costs $25). The onway will slide off the shaft and hence you'll have to hold it in your pocket or something.
It sounds like you're fine though.