Anyone know off the top of their head the bolt size and thread for the two bolts that mount the linderman mount to on top of the recoil? This morning I tried a "standard" (whatever that is) 5/16 coarse thread bolt and it starts and will go a couple turns and stops, so I'm guessing the size is 5/16 and maybe the thread is just a fine thread? Anyone know for sure? Oh, on the M1000 motor BTW. Thanks!!