Topic Author's Original Post - Apr 16, 2018 - 07:20am PT
During a recent re-bolting effort, one particular 5-piece was very difficult to remove. We tried to loosen the bolt, but it was just spinning inside the hole. I tried to re-seat the cone with a funkness device and had no luck. I also tried prying against it with a large crowbar while using a wrench to loosen it, also producing no results. I think the issue was that the original developer had filled the hole up with silicon which I think may have caked up the threads. Anyone have any thoughts or experience removing something similar?
The problem with that design is the ease with which the blue endcap comes off during installation leaving the exposed threads on the cone to get filled with rock dust and jam once you tighten the bolt. I learned this the hard way setting up a route at the Red in Kentucky with 1/2" X 6 3/4" 5 piece bolts.
Only one out of six tightened down properly so I had to remove the rest and try again using a spitball of toilet paper under the endcap which solved the problem.
Fortunately I had lots of tools on hand to allow me to do the removal by prying and tapping on the bolt head. Since that isn't working for you then consider spinning the whole show with a drill as you pry and see if the wear will allow you to back the bolt out. If you are working with soft rock then that should be easy.
What size 5 piece are you dealing with?
The ones I actually got out were 1/2" x 3.5" and completely caked with silicone. I like the idea of using a drill to loosen it as I pry. I could probably get more leverage with the pry-bar if I'm not having to crank down with a wrench with my other hand at the same time.
If it moves a little, another option is battery powered grinder cut it and then tap it back in the hole and patch with natural sand/dirt from area. Then drill a new hole. Done right you should barely know the hole was there.
Careful not to grind the rock itself. A couple pieces of tin on either side should help protect it while cutting horizontally.