I think I ended up using an impact driver on one of them. One of them came out fine for me. The trick was having someone hold everything while I whacked (I believe my wife was supporting it against the footpeg while I did this because the wire is still attached). Of course, just in case of future need, I ended up replacing the phillips head with allen bolts (like the NSU screws). I do not remember the pitch or size now. I was waiting on the gasket, so I just took the screws down to Ace Hardware and matched them up.