after you smoke at least 1 or two bowls it should be in there for good, just dont scrape the bowl every time you're done smoking and it will stay in there.

i dont see what the problem is, mine has fallen out in my pocket before but its just a screen i have a bag of around 1000 of them that i got for like $5 on ebay.

but if your bowl has some resin in it the screen will stay put.