=4.= The detonator C is formed with a flange S on which are two lugs T.T. for the purpose of turning the detonator when in position, so as to secure it under the heads of the holding studs R.R. On the face of the flange S is fixed a brass plate spring U, for locking the detonator into position. The two grooves V.V. in the flange S of the detonator C are to allow the flange S to pass the holding studs R.R. during insertion or removal of the detonator.
[Illustration: =Fig. 52=.--HAND GRENADE (MARK I). Scale ⅓]
=5.= The cap A carries a steel needle W for firing the detonator. Two small indents X.X. are formed on the cap to engage with the groove M on the body B. The raised lips I.I, are to allow the cap A to clear the indicating knobs P.P. when the cap is being placed or removed from the body of the grenade.
=6.= Two raised lips K.K. are to allow the cap A to move forward when the cap is turned into its firing position, the lips K.K. being raised sufficiently to clear the stop pins Q.Q., this only being possible when the cap is in the firing position. The raised portions Y.Y. are for the indicating knobs to engage with when the cap is turned to the travel position, and thus give a further indication when the cap A is in this position. The cap is also fitted with a safety-pin Z, which passes through the needle and the cap, and prevents the cap moving forward while the pin is in position. The pin Z is secured by a whipcord becket passed over the cap A, and is also further secured by a thin leather strip d passing through a slot at one end, it being necessary to remove both these safeguards before the pin Z can be withdrawn. The safety-pin Z is also passed through the cap A in such a position that if by any mischance the detonator C was not properly secured after being placed in position, the act of placing the cap A on and turning it to the left into the firing position causes the pin Z to engage with the two lugs T.T. on the flange S of the detonator, and automatically locks the detonator under the heads of the holding studs R.R.
=7.= The hook _t_ fixed to the body of the grenade is for attaching the latter to the soldier’s belt. The grenade with the stick downward is hung on to the belt by the hook.