Very good point. My weakness in that area is I'm a gear head & have done plenty of fabrication to get something done.
I am more inclined to put the color head up on Ebay as-is for parts.
It needs the rubber rollers replaced & the IR glass is broken.
The good news is that the electronics seem to be behaving, etc
So maybe what I get for it will pay towards the 135 lens

Thanks for the intervention