so i have a bike and it is hard to find a proper size seatpost and i settled for a steel one that is about the right length (could be longer) and can fit in the seattube (also steel), it is not too big but slightly too small. i can close the quick release clamp (i need to take the seat with me cause it is expensive) however i can still turn the seatpost slightly, this can happen when riding. now i don't think the seatpost is sinking but i haven't taken it for a long ride yet. now what about the turning, i take it that can't be good for the bike in the long term, is that right? are there any solutions?