Posted by Sherman in Idaho [108.162.245.7] on Wednesday, December 14, 2016 at 15:57:31 :
In Reply to: Re: why special screws/ posted by scott56 [199.27.128.153] on Wednesday, December 14, 2016 at 10:30:09 :
I don't think they're really acme. I think they're basically sheet metal screws with the sharp edges either not formed, or rounded off due to rust and repeated removal/insertion.