J-20 Juno and J-33 Wheesley engine dont snap

[WAKSLOB]

Im in the Vehicle Assembly attempting to build a sub orbital plane and when i attempt to add either the J20 or J33 engine it does not snap or bind. I have no idea if this is user error or if this is KSP glitch. Please let me know thanks. 

[bewing]

Often things won't snap if they default to pointing in the wrong direction. When you have grabbed one of those engines, try clicking the S key to reorient it. (The WASDQE keys do 90 degree rotations in the VAB/SPH.)

The other way you  can sometimes get things to snap properly is to hold down the Alt key while you are trying to snap them.

 

[pincushionman]

I assume you already know they need to attach to nodes on other parts, and that's what you're trying to do.

A quirk with node attachment, though, is if  you're looking at the end of a node attachment, it won't attach. You need to rotate the view so you're looking at the attachment from the side. I don't know what the threshhold is where it works.

This happens in the VAB too, but you tend to encounter it more in the SPH.