HALE AP, Technical Manual

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Figure 41. Wrap Around Clearance Rings – Pump Heads
C. Drill thru clearance ring but NOT into pump head. See Figure 41.
Figure 42. Clearance Ring Drilled Out (MPB Pump Head)
D. Using a chisel and hammer, bend clearance ring slightly inward at holes.
Then cut clearance ring thru with chisel. See Figure 42.
Figure 43. Clearance Ring Bent Inward And Cut Thru
E. Remove clearance ring.