The book lists 8-13 lb/ft for type 35 box. Settings this low can be hard to judge without a suitable torque wrench, or a very experienced hand. For similar low torques I use a 1/4 drive socket bar torque wrench with an overall low range of torques, as larger wrenches will not be accurate at the extremes of adjustment. The issue is the problem of squeezing out the cork gasket, and the bolts easily loosening off from low torques....IMHO. Noting a previous post about the inneffectiveness of spring washers, I try to find flange headed bolts with teeth on the flange- helpful in stopping the sump bolts loosening off.