Window crank arm shaft sheared off - how to replace?

A home owner from Madison Heights, MI says:
I have the above window in our bathroom, which rotates open at the top with an "X" crank arm at the bottom (see last pic).

The handle came off, and the metal shaft inside it was sheared off. This window is probably 10 years old. Inside the handle it is stamped "OP05-7810" (That is the letter "O" at the beginning).

Based upon the parts I think it is a Roto window. I am looking for replacement parts as well as any disassembly/reassembly instructions. The gear operator is somewhat grouted in on the inside, so I don't know if I have to chisel it out or if there is a way to get at the broken off piece of the shaft still in the the operator section.

Is this just a matter of replacing the handle with a new one with a new shaft in it, or does the whole thing need to be removed?

I can't find a part number for the gear operator itself. The 4 parts of the arms that open/close the window (pic window4 above) have parts labeled OP05-2016, OP05-2017, OP05-2018, and OP05-2019.
User submitted photos of a window operator.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Looks like you have the older style Roto operator. This takes our 39-226 male hex drive handle. Does that look familiar to you? It's possible that could be all you need.

It might not be a bad idea to try and remove that broken piece. To do so, try drilling a hole and install a screw--not too large--into it and try pulling it out. It just might work. You could have a job on your hands chiseling out that grout around the existing operator, though. Frankly, you may even want to contact a local professional for that.
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