Although there are many techniques to mount butterflies and moths, below is a description of the one I prefer.
All techniques described have their strengths and weakness' but all follow a few basic plans.
Furthermore, some modification may be necessary, depending upon the characteristics of the specimen being mounted. This technique takes some practice to learn the proper pressure, but it will stun the specimen immediately and prevent it from damaging itself. After insects are dead, they become extremely brittle. However, dried specimens can always be relaxed and mounted in any desired position. The only potential drawback is mold.