Hi Hooter, welcome here where we try to help.
I can't remember what starter cup they were using but do you have the correct nut holding the cup on. The correct nut has the thread go down inside the starter cup so you get an extra 3mm of thread and it also centralizes the starter cup. I do have a lot of motors here but I am on the opposite side of Melb to you which is a pain

Last edited by NormK; 31/05/25 04:40 PM.