Jack,
I would suggest to not use anything larger than a 1/4″ drive socket set to tighten the bolts to avoid warping the cover. The small drive will let you get it plenty tight without risking breaking the bolts also. Jim”
Let me add this to Jim’s sage advice: Wrap your hand around the HEAD of the 1/4 drive ratchet and don’t use the length of the handle. Over time, you will have to snug all these bolts up perhaps four times. Err on the not-so-tight side and re-snug several times.
Fortunately a 1/4″ drive is what I used, and as luck would have it, I tightened the nuts by holding the head, largely because space was so cramped in many spots that I couldn’t have used the end of the handle if I’d wanted to. Everything seems snug. Thanks for the advice.
Jack