Suzuki DF2.5: Looking for advice/tip

@Crazyfisher. Sounds like you've taught yourself a good bit about maintaining your 2.5.

I bought mine about 1.5 years ago but I only use it relatively nearshore so I'd estimate it has 20-25 hours on it. I went to drain the float bowl last night (for the first time ever) and can't get the screw (side of float bowl, with spring on it)to move in either direction. I can apply enough force that it feels like I might strip the head. Do you have any advice about this one?

Thanks for any suggestions you may have