[Therion] new symbol for therion : a hammer

hello, I would like to add a new symbol in my survey. A hammer. In France we use it to show place where we dig. I've wrote the Meta Post code, but I've not test it yet (I must first find the doc I have read on therion building to add a new symbol). Could you add it in the next therion release if my code is correct ? Thanks, code metapost def p_entrance_MY (expr P,R,S,A)= T:=identity aligned A rotated R scaled S shifted P; thfill (u,-.9u)--(-.1u,.3u)--(.2u,.6u)--(-.2u,u)--(.2u,-u)--(.6u,-.2u)--(.1u,-.3u)--(-.9u,-u)--cycle; enddef; initsymbol("p_hammer"); let p_hammer = p_hammer; endcode PS : I sent an drawing of the symbol as a join image