Advice fo small diy led

[megs_clark]

I have my LEDs so now im trying to get everything togather. Iv looked at alot of builds and wondered what the best route is on attaching the leds to the heatsink. Some of the threads had screws and some didnt. Could someone let me know what is best. And if I should screw what type of screws should I be using? We dont mind drilling and tapping if thats the way to go. I didnt know what the difference is. Also (sorry for all the questions) I should buy
20g wire? And Flux core solder? I just wanted to double check. Thanks again for any advice.