Mike , we have a metalurgist on this site, just can't remember who it is. Some of the other guys might suggest a more suitable steel. The biz 80 work hardens (which is why I liked it)
The symmetry of the profile is important. The rollers should have a .001" clearance.
I think the clearance gives an indication of how accurate they were supposed to be.
I did have a few laser cut from the 250 or 300 or what ever it was, but I can't remember exactly what I used
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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