Recently started climbing at Mountain quarry and noticed that about 50% of the climbs we do, eg Penthouse, have top anchor ring bolts too small to fit a bight of rope through. Is there a particular reason to choose small ones, strength, cost, weight?
No particular reason other than they were the ones available at the time. They sound like locally (Australia) made ones (totally fine, just no ratings or EN standards). It has really only been in the last 3-4 years that we have been able to get hold of high quality 316 P-bolts at good prices.
a short term solution might be to add some SS twist shackles