I started installing anchors in caves in the early 1980's and I was always led to believe that 'Spits' were the self drilling anchors that, once installed, you would break off the top section of the bolt with the special driver and then install a traditional hanger plate. The break, unfortunately, wasn't always clean and could damage the driver and/or the hanger. I've never actually seen one but i'm sure there is a photograph of one in a caving book. Not one I have unfortunately. I think you might have to be over 50 to remember them.
I think it's just been a continuing tradition to call all drop-in type anchors 'Spits'.
The videos of removing an old self drilling anchor and re-installing the new 'Twisted' anchor have me confused. Is that not a diamond core drill? I thought the recommendation was not to use a diamond drill bit for the new anchors. I assume the hole is then 'roughened' with a standard 16mm drill bit?
The removal did look easy though.
However, when the bolt is in anything other than the horizontal and you haven't got a coolant pool and instead of being stood up in your casual clothes on a nice day, you will be trussed up with all your caving gear whilst suspended from another bolt with a big heavy drilling machine in one hand, at arms reach and water trickling down the back of your neck through the gap in your oversuit!!!
Not so easy then.
It would have been nice to see a fully installed anchor with all the excess resin removed from the rock around it and, in particular, around the lower inside section of loop where ultra-lightweight alloy carabiners and 9mm ropes (as referred to in another thread) may be attached directly. Excess resin that is not removed from here and allowed to set hard could, subject to a dynamic load, lead to the catastrophic failure of the carabiner or, more likely, the rope. Remember the tests carried out to determine 'Full Strength' of lightweight connectors and ropes use a 10mm round bar, not a jagged piece of hardened resin.
Mark