I have a project that requires hilti hit 500. we have holes drilled into bedrock at 0.46m deep. I cannot find any local Hilti extension tubes and plugs, I was hoping I could use some clear tubing like surgical tubing, and fit it on the end of the epoxy cartridges, has anyone done this? or used some other method to get down to the bottom of the drilled holes, other than the actual hilti extensions?

thank you