Thank you Otto and Kevin for your input.
I beleive the original "nuts" in these aftermaket housings are brass or something similar (not magnetic). The holes in the housing are square but there does not appear to be a square feature on the "nuts" to engage it. building up the housing area with JB Weld then drilling and tapping may be my best bet to save these otherwise new housings.
Kevin, I saw and replied to your PM.
