For our lab we are supposed to find the internal resistance of a voltmeter(labeled R(load)) using Thevenin equivalents.

Pretty much every Youtube video and textbook example and resource online has far more complicated circuits that don't seem to apply to our problem. On top of that, when it gets to finding Rload, they are always given it and use it to calculate Vload or something else that we don't need. We found Vth to be 4V and Rth to be 0.5M Ohms. From here we have spent literal hours trying to find some way to get the Rload of the voltmeter. It is incredibly frustrating and any input would be greatly appreciated.