Thanks gubar and Bullet
Gubar I dont have any problem since I started using the metal ray approximation editor for displacement maps, Im not a great lover of displacement but will use then if it fits the bill(I have added the link to were I found out how to use it) Bullet I did it this way because the poly count was getting to high for such a little part, if I was doing just the helmet on it own I would have done some thing like you said............dave

https://www.spafi.org/maya-modeling/m...n-displacement