In the guide it says "Tip: To get the nut through the round hole drop it in the hole, then use the end of an allen key to level it and use a fixing from the rear to pull it into place." However, when I do this I can't get the nut to stay in place; it just falls out again. I haven't got that far in the build yet - just working my way through the parts preparation, so I'm not sure how important it is to get those nuts to stay in place. Does anyone have any tips / advice, or should I just ignore it? Thanks!