ANSWER
Mr Chairman, this bomb was built by the SpecialForces of the SADF for this specific operation.   If I remembercorrectly, Joe Verster pertinently asked me what kind of vehiclewas used, I had to go and find out what the registration numberwas so that we can determine the number of the chassis and sothat they could build a ready-made bomb for this specific vehicle.  This bomb was specifically built with plastic, plasticine, itwas about 4kg, it was
2b designed /...
MR DU PLESSIS 590 J HECHTER
designed in such a way that it could be mounted on the vehiclewithout the necessity of light, without you having to see whatyou were doing exactly.   The precise measurements are difficultto tell, it was approximately twice as large as a normal foliopage, I would say it was about 2-3cms thick.   The explosiveswere in a black tin or plate covering which was in a square form.  This bomb also had a safety time mechanism.   After the bombwas mounted you pulled out the safety pin after which the bombwould be activated 30 minutes later.   The bomb also had two separatepush buttons to let the bomb explode to prevent a malfunction.  After the button had been pushed, on request, there was a 30second time lapse.   We suspected where Mr Ntuli would be thatday approximately and we knew the route he took to his house.  We also knew that he was a person who normally drove at onespeed.   He kept to the speed limit.   We thought if there wasa 30 minute time lapse, sorry 30 second time lapse he would bein an open piece of veld and we wanted the bomb to explode inthat area that was not built up, but we did not want to followyou so that we would be noticed.