Sportshift Lever Question. Help!

[Steve S.]

I'm not sure why but my sporshift lever seems to work as it should changing the gear box from a 4 to 5 speed.  The problem is the lever itself can easily be moved from one mode to the other.  I have hit this lever with my foot or leg and inadvertently and found out the hard what that I had went from a 5 to a 4 speed.  Is there a way to "lock" this lever in a position so it doesn't move so easily? 
Any help/siggestions would be greatly appreciated before I blow my transmission up!  Thanks.

[rocketman]

 Steve, there's spring tension against the shaft in two points. Inside at the pin (fork guide) that holds the drum from rotating. The other point is a wave washer behind the lever itself. Is that wave washer in place? You could replace it if damaged or missing. You can shim it tighter with a second wave washer or shim washer to make the handle harder to rotate. Only way I see to keep it from being  "kicked" out of your selected mode would be to safety wire it. It seems to be a common occurrence.  Mark.

[Steve S.]

Hi Mark,
Thanks for the suggestions.  Yes, the wave washer is present, but perhaps it is not providing enough tension.  I will see if I can shim or add another.  I will let you know how I make out.  Thanks again.

Steve

[wonkyworks]

I ty-rap mine to the frame tube so it won't move.