I've got my neander bench base almost built, hurrah!, just need to bolt the stretchers to the legs. (Common knock-down construction: 10mm hole through leg into stretcher end grain, with a perpendicular hole in the stretcher to take a nut (tapped pieces of 8x18x35mm steel)).
Anyway, how do I make sure I drill this long leg-and-stretcher hole straight?
The only way I've thought of is (1) drill the holes into the legs first. Don't know how I'm going to ensure it's perpendicular to the leg - trestle legs too big to put on a pillar drill; (2) use the holes in the legs as a guide to drill into the stretcher end grain. What sort of drill bit do I need to use here? Is there any danger of it wandering off course in the end grain?
Or is this simpler than I'm making it and that actually judging it by eye and using a long twist drill straight through from the leg in one go is sufficient?
Insights gratefully received :)