hi guys i have just changed the clutch and gearbox, but i couldnt get the bolt inside the offside drive shaft to the transfer box, its a long bolt with a 6mm allen head. So i put the rest back together and left it out but now it appears to be leaking from the driveshaft, i know its probably obvious but is that where it would leak from if the bolt wasnt there and are there any tips on getting it back in thanks