Per the Ohi Optical homepage, all Masuyama eyepieces have the focal plane exactly at the transition between the lower and upper barrels.
Did a daytime test.
Focused on a 300 metre distant tree.
Used the Pentax XW20 + MPCC spacing combo, locked focus.
Used the MPCC with Masuyama 32mm with 14mm spacer, yielding ~ the optimial 55mm focal distance.
Exactly in focus.
However the 130PDS requires a 2” extender to reach focus.
The internal lip of the extender restricts the insertion of the Baader MPCC/eyepiece combo into the 2” focuser.
As a result the focuser has to be racked in all the way to reach focus.
The focuser tube comes within an inch of the 2ndary mirror.
It blocks out a large portion of the primary mirror.
This option is not feasible.
The only option is to unthread the eyepiece set screw black holder on the aluminium 2” focuser tube.
Fabricate a custom 2” extension that will thread on to the 2” focuser tube and be thread on the opposite end to reaccept the black 2” eyepiece set screw holder.
An expensive option.
Looks like the APM 30mm UFF will be the best least expensive option.
I do have a TV 31mm Nagler type V and will give it a try but it much heavier than the APM 30mm UFF.