Is the screen a permanent fixture on the lid, meaning do you remove it or want to leave it on all the time? If you want it on so that it can't come off and the screen is flush with the edges of the lid, you could silicone it in place. The only thing with silicone is the smell whiles its curing. You'd have to move the gecko away from it for a few days at least.
Red 
P.S. does your gecko ever get his nails caught in the yarn?
>>well...right now its just sort of paper clipped on....lol He can't reach it anyway...it just makes me feel better and helps keep crickets in...lol I'd like to staple it on...but a regular stapler doesn't have enough force, and I don't have a staple gun...
>>-----
>>Christina
>>
>>
>>
>>Leopard Gecko Morph Descriptions
>>
>>2.3 leos
>> -0.1 tangerine het rainwater albino w/jungle background (Blinkers)
>> -0.2 jungles (Vahz & Skissor)
>> -1.0 tremper albino (Spitfire)
>> -1.0 tangerine rainwater albino (Bronx)
>>
>>-ignorance is not to be punished when one is trying to gain knowledge...what scares me is the vast number of people who, when given the information to gain knowledge, choose to ignore it.
-----
Crested Gecko Zeek:1.0, Ziggy and Zeus
LEOS: Boo: 1.0 normal , Bronx & Nala: 1.1 blizzard,
Lily: 0.1 patternless, Abby: 0.1 albino, Zoe: 0.1 reduced pattern, Dot: 0.1 hypo
New Girls: Flame, Karma, Bubbles and Bell pics coming soon
Chip: 1.0 papillion (small dog)