Our Br.sink stopper also got caught between the top and the bottom and broke. See mympost on the article I recomend under painting fiberglass. Send me a Pm if you can't access the article and I will copy and mail to you. Smeraldo53135@Peoplepc.com
Then I discovered if you bend over and look under the faucet spout yuo will see a small loop where I used a bread bag fastener to clip the chain with stopper to the faucet. Now i won;t have the stopper get caught b etween the upper and lower section again. Idon't know if all HIlO'S have this. The faucet may have been replaced.