sorry stubs, i seem to be having a problem in replying to your question by pm. The bomb in my name is short for my old rank with the guns and does not allude to the trade you are thinking of. Unfortunately I cannot answer your question, but this site is a wonderful mine of information and someone on here will be able to help, try posting in the sappers forum. p.s. the bear is not a dig at you, i just liked him in my sig block.