South Bend 13" mechanical restoration

Freshly painted parts for the apron & saddle.

Has anyone seen this on the saddle ways before? Seems like it's ground down in the middle but looks like it's factory? Can anyone confirm? Only in the middle of the saddle ways. Are they suppose to be smooth the whole way across? It slides fine on the ways of the bed but seems strange.
 

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Mostly put back together. Got the apron and saddle back on. Just need to do the control box, make a mount for the SM Vector drive, some wiring, then also glue the belt on. I found a serpentine belt from a semi that is the perfect size that I was able to get for free that I will try out.
 

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Been working on finishing up the wiring and belt. Old belt didn't work out...went to tension it and it was way too tight, had to cut it off...must have measured wrong...With the new belt I wrapped it around the pulleys and marked it as tight as I could pull it, put it together like that...hoping it will be good.
 

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Mark the spindle pulley circumference where the dog drive engages.
 
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