Got the thing apart! Thanks to all.
Well I got the rust welded coupler apart.
For to help others: 1st I had to beat the scale off it with ball peen and cold chisel. Then used a stiff wire wheel on angle grinder till I could finally make out the line btwn two parts then pounded stiff knife into joint while turning shaft. Once it opened went to small screwdriver, cold chisel and couple of wedges till I finally popped it loose! Oh plenty of p b blaster as well. The tool you created looks like it would've saved a lot of time Dave. Thanks for the reply.
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