Was trying to replace a 1x Sram chainring and was able to remove two of the 5 but the other bolts were super tight and i stupidly stripped two of the remaining three drive side bolts…
I can’t unscrew the non drive side bolts (just spins) without holding on to the drive side bolts.
by willlew514
8 Comments
Easiest way to salvage would be leaving that ring on there. Otherwise you can use a bigger allen or torx bit and hammer it in to the bolt, or drill them out with a fairly large drill bit
Hammer a larger torx into the one side and try to remove them.
I think those are sufficiently wallowed out that you’re going to have to drill them. Use the smaller hex key to hold it from the other side whilst you drill. I’d say it’s all time for some new hex keys, as I think the rounded corners on those pictures are the real culprit here.
To me, it looks as if there might be sufficient access there to use a small abrasive cut-off disk in a rotary tool (e.g., a Dremel Moto-Tool) to cut slots in the fastener to allow use of a flat head screwdriver.
Edited to add: If the hex is sufficient to hold from the one side, then I agree with other comments about drilling from the destroyed side being a preferred way to do it.
This is one place Dremels are very useful…. especially if you have a cutting disc that is small or one that has been worn down already to be small.. (i.e. diameter about 3/4 the size of that bolt head)… you just grind a notch in and then use a wide flat head screwdriver to unscrew it
Bigger torx and controlled violence?
Does it spin on drill?
You could use an extractor bit