Registration points on a round internal surface

[supinemonkey]

Hi, I'm trying to put simple registration points onto an egg shape and having no luck. As you can see in the image only 4 of the tube shapes will join to the inside of the wall correctly, using the 'to object' distance. The end 2 seem to break the solver. What am I doing wrong here? The error message is characteristically enigmatic:

"Extent boolean fail. The termination entity might not be fully intersected with the tool body built along the operation direction."

Is there a better way to accomplish this? Thank you.

[dmorse · Accepted solution]

Try selecting the back side (outside face) of the egg.

I was able to create the extrude selecting that face.

[etfrench]

Use the Extrude|New Component or Extrude|New Body operation and make sure the extrusion extends past the outer shell of the egg. Use Combine|Cut operation with Keep Tools option to split the extrusion in two. Delete or hide the extra body. Join the other to the egg.

[supinemonkey]

Thank you! Would have loved this to be a single extrude but I had to do it in three.