Update: plucked up the courage to take the forks off, fortunately the headset has caged bearings so that made it a lot less stressful. Checked it against a straight edge and nothing's bent. I found another 25.4 stem I'd forgot I had, which luckily went in past the min insertion point, so the bike is at least safe to ride and I didn't have to worry about shimming the bars. Interestingly, each of the four stems I tried went in by different amounts, between 52mm and 67mm. So I guess that means that where the steerer tube walls get thicker, different stems fit further down depending on their actual diameter, which I guess differs slightly and isn't exactly 22.2mm on any of them? Anyway. Cheers all, think I can at least rest assured that the fork probably isn't fucked!
Update: plucked up the courage to take the forks off, fortunately the headset has caged bearings so that made it a lot less stressful. Checked it against a straight edge and nothing's bent. I found another 25.4 stem I'd forgot I had, which luckily went in past the min insertion point, so the bike is at least safe to ride and I didn't have to worry about shimming the bars. Interestingly, each of the four stems I tried went in by different amounts, between 52mm and 67mm. So I guess that means that where the steerer tube walls get thicker, different stems fit further down depending on their actual diameter, which I guess differs slightly and isn't exactly 22.2mm on any of them? Anyway. Cheers all, think I can at least rest assured that the fork probably isn't fucked!