Question: My VMAR ARF came with a nice fibreglass cowl and 3 or 4 retaining screws. How do I use the screws?
Answer: Generally we recommend screwing the screws into the edge of the fixed firewall at the forward end of the fuselage. Use one screw on each side and one at the top of the cowl. Or you may wish to go with two screws on each side and forego having a screw at the top. Leave any opening (slack space) at the top and sides, try to avoid a gap at the top.
To prevent the holes from chaffing out under vibration you may wish to enlarge the holes just large enough to accomodate a small rubber grommet (servo grommets work well for this) and then put a flat washer under the head of each screw.
Before drilling any holes in your cowl, we recommend thoroughly reviewing your manual AND the related articles attached here. The article from Model Airplane News is well worth reading. | 
