I would suggest a couple of other things.
1. I'd be VERY careful about immersing the plastic in hot water. You could warp it beyond the point of no return.
2. If you have a strainer or some other kind of basket that you can put over the pot, put the part in there and let it sit in there for a minute or two, and gently move the part. Once it's in the desired position, put it on the counter AWAY from the heat, DO NOT touch, and allow it to cool thoroughly (about 20 minutes.)
3. This may take time, and might take a few steps, caution is the watchword.
Charlie Larkin