About this 3D model

I tried to use the Base Spool Holder from this Model to use it with this Remix . But it does not fit. You know why? The origin Spool Holder has a left-hand thread, but the remix needs a right-hand thread! Costs me hours to detect the problem. So I created a new version of the Base Spool Holder, but with a right-hand thread! And here it is.