home made reflector? (how)

[waddup]

im thinking a desk lamp and aluminum foil some jb weld and time,



anyone got a better technique?



ill get mine from local thrift stores but this is the shape ill be looking for.



looking for all throw, maglight D size





http://cgi.ebay.com/Vtg-Mid-Century-...ht_3865wt_1120



http://cgi.ebay.com/White-Metal-Cone...d#ht_500wt_901