Mall Saw

[Rollerman]

I have a Mall circular saw model 70, 12 Amp motor, worm drive saw
It uses a 7 1/4inch diameter blade. The blade has a 13/16 inch square hole.
The saw has hardly ever been used.
Is there any source for replacement blades?
I am not sure that I can the blade I have sharpened unless some shop has a 13/16 inch square arbor to mount the blade.
I have considered wire EDMing a square hole in an existing blade.
Any suggestions?

 

[Vecair]

Are you sure the hole is actually perfectly square or is it the typical diamond shape typical of all Skil 7-1/4 inch saw saw blades when the knock out plug is punched out?

 

[Rollerman]

I can see the diffrence between square and romboid.