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I thought it would simplify matters if I included a photograph of my own nailing, which experience has shown to be satisfactory for ordinary fell walking. Any well-known maker of climbing boots will, on request, nail them to this pattern, which is as follows:
Three No. 6 Tricouni round the toe of each boot.
Clinker in pairs round both edges of the sole.
Large muggers well distributed over both sole and waist.
No. 1 Tricouni near each edge of the waist.
Malleable serrated capping on the front edge of each heel.
Overlapping clinkers on the rim of the heel, and also spaced singly round the sides of the heel.
OED definition #5 for mugger (n.): "A nail, usually of soft iron, used in the soles of mountaineering boots to improve durability and grip.
Following the introduction of cleated rubber soles in or around the 1950s, these and other types of boot-nail fell out of use.
1941 C. F. Kirkus Let's go Climbing! v. 68 For the inner part of the sole muggers, rough wrought iron hobnails, are excellent.
1970 A. Blackshaw Mountaineering (rev. ed.) iii. 99 Soft iron nails which grip as a result of the rock biting into them (muggers and clinkers).
1992 W. Unsworth Encycl. Mountaineering (ed. 2) 236 Hobs gave way to muggers, which were of soft iron like the hobs and allowed the rock to bite into them."
I guess it as "bottom girder-->ボットムガーダ-->ムガー" not "ムガ". Reason: in http://www.sunfield.ne.jp/~tkubota/yougo/Ka.htm#クリンカー it says "【クリンカー】Klinker{German}【ムガー】【トリコニー】tricouni{French} 登山靴(鋲靴)の底に打ち付ける鉄製の鋲(びょう)。やや長手で側鋲につかうものをクリンカー。丸く平で中鋲に使うものをムガー、やや大きめで土踏まずにつけるものをトリコニーという。どの鋲をどこに配置するか登山家それぞれの流儀や秘伝があった。現在の登山靴は、鋲は使わず、ゴム底(ビブラム靴)になっているが、そのトレッドパターン(靴底の模様)は、クリンカーやムガーを組み合わせた形になっている" Here "ムガー" can have a French word source but my French terms are limited. I cannot remind of it now. You may better seek answer at JP-FR Kudoz forum.
I thought it would simplify matters if I included a photograph of my own nailing, which experience has shown to be satisfactory for ordinary fell walking. Any well-known maker of climbing boots will, on request, nail them to this pattern, which is as follows:
Three No. 6 Tricouni round the toe of each boot.
Clinker in pairs round both edges of the sole.
Large muggers well distributed over both sole and waist.
No. 1 Tricouni near each edge of the waist.
Malleable serrated capping on the front edge of each heel.
Overlapping clinkers on the rim of the heel, and also spaced singly round the sides of the heel.
OED definition #5 for mugger (n.): "A nail, usually of soft iron, used in the soles of mountaineering boots to improve durability and grip.
Following the introduction of cleated rubber soles in or around the 1950s, these and other types of boot-nail fell out of use.
1941 C. F. Kirkus Let's go Climbing! v. 68 For the inner part of the sole muggers, rough wrought iron hobnails, are excellent.
1970 A. Blackshaw Mountaineering (rev. ed.) iii. 99 Soft iron nails which grip as a result of the rock biting into them (muggers and clinkers).
1992 W. Unsworth Encycl. Mountaineering (ed. 2) 236 Hobs gave way to muggers, which were of soft iron like the hobs and allowed the rock to bite into them."
xxxskellyfish Local time: 00:29 Native speaker of: English PRO pts in category: 8
Grading comment
Never thought I'd say this about "muggers," but this "mugger" encounter made my day.
Thank you, Shannon!
The translation workplace 
