Final pick of my sideways shorty modification. I used four 3x35 flat head crews at waterfall brace and where thumb screws are to really brace it. The JConcepts battery brace if for the B5M. I drilled a small hole at the waterfall brace. Used one of the small flathead screws from the sideguards. I slip the brace over the screw and slide the battery in.
As for cracking at droop screws on the front A arms. I have not seen this. That is crazy tolerances though.
I have notices a crack in the same spot when I was taking this pick at the shock attachment. Going to let him drive it that way and see if it breaks.
I have broken two front A arms in 1 year of practicing on indoor clay. My son drives the Dex and he drives it hard. Been very durable. More than the B4 he drove before.
I boil all my arms for 3-4 minutes though.