One Piece Layshaft Gear Binding in x6sq

[MeBeMikey]

I have always ran associated top shafts where it has the spacer and car runs perfectly. Now, I just installed the Xfactory one piece Layshaft an gear and it binds the tranny up. Iv taken apart the tranny 4 times now and installed my used (still good cond) associated Layshaft with spacer and it works perfectly.

Am I missing something? Has anyone else had an issue?

Thanks!

PS! I go my UK F2 class rating! I'm off to the Nationals next year!