The fork lever in the pic is the Focus type,the early one was one piece but the Focus is two parts spot welded together.One half takes the roll pin used in place of the bolt,the other is the lever that moves the forks.
It can fail in 2 ways 1)The roll pin can break as the bolt can..only good point is no bolt head to fall in the trans but you still loose gears 2)The spot welds let go( as was the case in a tower that came to me from SZ a couple of years ago) With the welds gone the lever will still not move the forks...again ,loss of gears.
On the 'keyed mod' to the Focus tower this cannot happen as both halves of the lever are locked to the shaft....no loss of gears. On the exterior of the Focus tower the top part can rise if not correctly locked on shaft..our mod will also take care of this issue.
Later Focus tower also had a redesign with a quadrant weight so the top part cannot move.This late quad tower can only be used with a later cable bracket on the trans and Focus cables. Moral is a Focus tower can still fail...without being 'keyed'. Should also note that the material of the two parts of the Focus lever is sintered and very hard...does not take weld very well and only cures one of the two issues as the pin can still break.The key stops ANY rotation load on the pin so the key is a 100% sure way of no gear loss.
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