BTW where are you getting the M72HV's with the flat head screws? The only ones I've seen like that were MP units. All the new Mellings I've bought in at least the past 4-5 years use the 7/16 head bolts. I hav'nt bought any MP's in long time. Every once in a while a customer will send one in to use on their engine that's when I see them.