I will need to mount a ST-90 to a Nylon engine mount.

My concern is that the holes in the engine mounting flanges are very close to the inside edge. I think I will have about 1/16" of "meat" left in the nylon mount arm after drilling out the holes. Instructions suggest #8 tap/bolt which will leave very little nylon on the inside edges. I could use #8 or #6 screws which would allow a slightly smaller drill hole but I still do not like it.

Now, this is not unique; I have always felt the engine mounting holes were too close to the engine side and the arms are difficult to get perfectly flush (there is a 1/32" bump on the side of the engine which prevents fully flush).

What is best practice here? I know there is lots of debate on screws versus bolts versus tapped and untapped but that is not what I want to debate. I am interested in how much nylon is enough and how to avoid losing most of the inside material on the mount while still having things firming secured.

Thanks.