Firstgear lock/block for dog ring box ?

[Elnef]

Last year I made a 1-2-1 shift with my dog ring box that cost me some racetime and money   
Now I want a firstgear blocking device
Has anybody here made one or got some photos or idea to make one ?

Thanks John

[Elnef]

First try with a strong spring an a little turn on gearshifter grap seems to work ok so far

[NoBars]

Vertigate?

[Berger]

Maybe there is a way to modify the reverse gear blocker in the shifter so the button also must be used for first gear?

[dangerous]

Karpiola/SF gears supply a "dooverlackie" that stops your issue.
It is mounted under the nose cone by a bolt
and pivots on the bolt as the hockey stick sweeps through its arc.

It is called the "pox preventer part". (true story!)
Give Jussi a call and ask for one.

The one that came with my gear set, came with NO INSTRUCTIONS,
so may take some ingenuity to fit.

[Elnef]

Thanks I will contact Jussi