On 14/05/2011 22:22, Andrew Mawson wrote:
I need some LARGE wood dowel screws - the double ended wood
screws the small variety of which are often used to fix wooden knobs
to doors.

I'm joining 5"x5" timber baulks upright onto 10"x5" oak railway
sleepers, so need perhaps 10mm or 12mm diameter and maybe 100 mm long.


You could try setting hex coach screw heads into the sleepers with
resin, and using the other end to screw into the uprights.