I just went through having two bolts snapped off on the DP side and two in the center section. I went with two stainless threaded studs and nuts to help future bolt issues and easy DP install. I'm gonna sell the left overs on the board for less than I bought them so it's in search results. I haven't heard of members doing this but having the bottom and top as studs was way easier to get the other bolts lined up straight without possible stripping.