Firstly, check that the weights aren't fouling on anything (brake caliper). If they are all clear, and you are still having issues, you can put some old fashioned cloth gaffa tape over the weights. That shit sticks to everything!! You prob only want about 20mm tape all around the weight on the surface of the wheel. And make sure the alloy is clean, coz if it aint, nothing is gonna stick to it!! I saw some Oldschool Group N race guys do this years ago and i asked why, they said to make sure the weights dont fall off. But as i said, make sure the alloy is clean before you try to stick anything to it, and make sure they clear everything once they are fitted. Pretty simple stuff, but can be overlooked in the haste of wanting to get the car back on the road. Good luck!!