How do i edit this drawing so i can change the dimensions of an already made linear rail? basically i want to change it from a 15mm rail to a 20mm ect but when i change the dimensions it messes the drawing up shown in pic below.

cheers

Ash

Click image for larger version. 

Name:	1.jpg 
Views:	496 
Size:	338.4 KB 
ID:	17609Click image for larger version. 

Name:	2.jpg 
Views:	486 
Size:	228.7 KB 
ID:	17610

cheers

Ash