TOOLS

1. Prior to the development of the Mark 6 Mod. 1 depth charge pistol and booster exten-der, sets of service tools were furnished for use with Mark 6 pistols and booster exten-ders. This original service set consisted of the following tools contained in a canvas bag.

1 Extender Testing Tool (Dwg. 180387-1 to 5).

1 Depth Setting Wrench (Dwg. Nos. 180387-10, 180387-A-10, or 180387-B-10).

1 Detonator Holder Wrench (Dwg. 180388-3).

2. The development of the Mark 6 Mod. 1 (deep setting) pistol and the Mark 6 Mod. 1 booster extender has necessitated an additional special tool to the regular tool set for shipboard use. This tool, the Packing Nut and Gland Wrench (Drawing 1803885), is being procured in quantities sufficient for issue to Forces Afloat at any early date, and will be issued in one of two distict ways: (a) as a separate unit, or (b) as a single tool having a Detonator Holder Wrench (Dwg. 180388-3) at one end and a Packing Nut and Gland Wrench (Dwg. 180388-15) at the opposite end.

3. A screw driver for making the deep settings on the Mark 6 Mod. 1 pistol will also be necessary. Depth setting wrenches procured for service tool sets of future issue will be manufactured with a screw driver on the end of the handle. It is not intended to replace depth setting wrench now in use with the new type, since any ordinary medium sized screw driver in stock on board ship may be used for the above purpose.

NEW SERVICE SETS

4. There will be two chief sources of supply for the new tool sets, the Naval Mine Depot, Yorktown, Virginia, and the Naval Ammunition Depot, Hawthorne, Nevada. These new service toll sets, when issued complete, will consist of either of the following assort-ments:

(a)

1 Extender Testing Tool (Dwg. 180387-1 to 5).

1 Depth Setting Wrench with screw driver at opposite end (Dwg. 180387-C-10).

1 Detonator Holder Wrench with Packing Nut and Gland Wrench at opposite end (Dwg. 180388-3 and 15).

(b)

1 Extender Testing Tool (Dwg. 180387-1 to 5).

1 Detonator Holder Wrench (Dwg. 180388-3).

1 Depth Setting Wrench with screw driver at opposite end (Dwg. 180387-C-10).

1 Packing Nut and Gland Wrench (Dwg. 180388-15).

5. When vessels, at present equipped with the old type tool sets, are issued Mark 6 Mod. 1 depth charge pistols and booster extenders, they should requisition Packing Nut and Gland Wrenches (Dwg. 180388-15) direct from either of the aforementioned depots, or the nearest issuing depot, whitout reference to the Bureau.

6. Those issuing depots which maintain a stock of the original type of service tools sets on hand for issue, or which utilize the Mark 2 Mod. 1 depth charge testing sets for test-ing pistols and extenders, are authorized to requistion sufficient packing nut and gland wrenches to make these sets applicable for use with Mark 6 Mod. 1 pistols and booster extenders direct from the Naval Mine Depot, Yorktown, or the Naval Ammunition Depot, Hawthorne. Additional wrenches may be requisitioned in order to maintain a reasonable surplus (not to exceed ten (10) for issue to vessels complying with paragraph 5 above).

7. The addition of the safety stop for depth setting wrench and the safe setting lock to both Mark 6 and Mark 6 Mod. 1 pistols requires that a pair of long nose pliers and a spool of No. 19 ("0.358 dia. copper wire) is issued for inclusion in the service tool set. The in-structions noted in paragraph 5 for requisition of wrenches also apply for these items.