Probescreen for manual probing?

Currently I have no probescreen added to gmoccapy. I searched for a screen and just found topics about probescreen which requires a probe with electrical contact to the probe input pin. 

I do not have a probe like this. I just a simple probe with a 10mm probeball where a light flashes by contact or a simple 3d probe with analog measurementvalue. 

Is there any option to deal with? Simply probing an edge is not that problem. But how should I find the piece zero inside a hole?! Could you give me some tips? Maybe there is still an easy way to find the center of a hole... This is my main problem for now. 

Hallo,
You can find the center of the hole in Manual mode.

- Jog the Maschine so that the probe stay near the middle of the hole.
- Jog X minus until probe contact
- Zero X axis (easiest way in gmocapy by clicking on the X-Letter of the DRO, you will get an Input panel)
- Jog X plus until probe contact
- go to MDI mode
- enter the DRO value of the X Axis divided by two I.e value shows 57.859 you need to enter G0 X[57.559 / 2]
- Zero X axis

- Jog Y minus until probe contact
- Zero Y axis
- Jog Y plus until probe contact
- go to MDI mode
- enter the DRO value of the Y Axis divided by two I.e value shows 67.859 you need to enter G0 Y[67.559 / 2]
- Zero Y axis

If you want, you can also write a small macro and put that on an button on MDI page.
Take as an example "go to position" from an Sim config. The DRO value is stored IMHO in a var value and can be reached from within the macro. But this is untested!

Norbert