Gun Drill for Q.F. 17 Ponder. Mark I, on Carriage 17 Ponder, Mark I - Engeland Voorschrift 26/GS Publications/1489 WO 7118 Gun drill for Q.F. 3.7-inch Mark I Howitzer, on Marks I to IIIr carriages 1941 - Engeland Voorschrift 26/GS Publications/653 WO 7343 Gun Drill for Q.F. 25 Ponder. Mark 2 Gun on RAM Chassis (S.P. 25 Ponder Sexton) - Engeland Voorschrift 26/GS Publications/1532 WO 7103