Hi,
I always have trouble attaching a PTO shaft with a tractor that has a locked PTO and some heavy equipment like a haybine or tiller where you cannot easily turn the shaft. The major problem is you cannot tell where the splines are on the female coupler. Attaching this is a 15-20 min greasy job with lots of frustration. I have designed a 3D printed plastic stencil that lets you paint marks on the end of the coupling so you can see where the splines are and see where to move the shaft as you do the attachment.
View attachment 519213
Attached is a ZIP file that has a document explaining further and source for the 3D part and an .STL file that can be sent to a 3D printer.
If you need any further info write me at
jim.schimpf@gmail.com