From what I remember my last oil change went without incident three rides ago. Then tonight while preforming another oil change as I backed out the three bolts that hold on the filter cover I see engine block shavings coming out on the bottom bolt (the allen headed one). The threads on the bolt don't look too good either. I don't know how I did this cause I always run bolts in with my hand and don't use the ratchet until it's seated. So I run a tap into the hole and then clean the bolt best I can. It seats and tightens sort of OK but feels weak. Should I go a size up on the bolt and re-tap the hole a bigger size? Or will just a fresh bolt the same size be OK? Also if I re-tap the hole is that an oil port through the bottom one and what about the shavings I'll create down in the casing?