Core drilling with KM Glass thin walled glass core drill bits is the newest and latest trick developed by Greg German - the Q of bolt removal. https://www.mountainproject.com/forum/topic/123882067/core-drilling-tools-for-bolt-replacement To make your life easier, we sell them at our shop https://hownot2.com/products/bolt-remover We only charge cost + 20% and supporters get 20% off. https://hownot2.com/products/supporter To play it safe, you can over buy in case you break a bit and return what you didn't use (aka - we can sell them to the next person). Just email us at contact@hownot2.com. The videos we review are: https://www.youtube.com/watch?v=q9sC0MYGWsY https://www.youtube.com/watch?v=wiPrZ3YOH74 https://www.youtube.com/watch?v=vJ01GQUkntA https://www.youtube.com/watch?v=LJAJdFXxrM0 Our videos we showed broll of: https://www.youtube.com/watch?v=8pgFzVqVEJY https://www.youtube.com/watch?v=5y-I7KqdDsA https://www.youtube.com/watch?v=58t0eHUJgbo https://www.youtube.com/watch?v=ppVYNCXy0-o You can also get them at Ali Express if you are patient and brave *Adapter https://www.aliexpress.us/item/2251801819153511.html?spm=a2g0o.order_list.order_list_main.12.63fe1802BhhGw9&gatewayAdapt=glo2usa *Bits: https://www.aliexpress.us/item/2255800785143721.html?spm=a2g0o.order_list.order_list_main.5.63fe1802BhhGw9&gatewayAdapt=glo2usa *Hose: https://amzn.to/3IXBhID *SDS to Chuck adapter https://amzn.to/3IWeddb *Hand pump (not convinced this is the best option) https://amzn.to/3TADyOP Team Tough and Bolt Products core drill set up https://www.team-tough.com/kern-deudiam-14mm-core-drill-bit-kit http://www.bolt-products.com/SustainableBolting.htm 👉 Learn and SHOP at https://www.hownot2.com/ 👉 Best EMAILS on Earth: https://www.hownot2.com/signup 👉 SUPPORT US and get gear discounts https://hownot2.com/support 👉 10% off ROCKY TALKIE by clicking https://www.hownot2.com/rocky