It can be done. You need little or bendable fingers to set the bolt into place. There is only one way to offer up the bolt to the hole, and you need to find the right approach angle for yourself. Then use those fingers to tighten as much as possible (which is not so much). Then use an offset ring spanner to very slowly tighten bolt. The spanner only fits from one direction too. It takes ages, but you only do it once.