What was the handle end was carved to provide a tight fit for...
Steel collar, ovalised in vise (i.e., squashed carefully).
The head is just a 'T' shape cut from 3mm mild steel. No use for serious torquing, but plenty strong enough otherwise - and will bend rather than break if pushed too far. The "tang" of the head goes down almost the length of the collar and its all held together with a pair of high tensile steel bolts (and lock-nuts - the ones with nylon inserts).
The pick is a DMM Predator (alpine) pick, because that's what was available at the time. Again, held on with a couple of HTS bolts.
The hammer is a steel hex-head bolt, slotted down the threaded shaft and held in place with a loose (non-loadbearing) split pin. Sounds iffy, but it seem to do the job.
The rubber grip is just an mountain bike inner tube - very 'tacky' and easily replaced.
