Attachments Not Rotating

I have an item for my hand that rotates like a propeler....
Using llTargetOmega for it - and a dialoge box to turn it on and off.

The trouble im having is when you attatch the item - it refuses to start turning. It will start turning if you right click it and highlight it and release.

It needs some type of kickstart! But I havent found one that works.

list buttons = ["On", "Off"];

default
{
     on_rez(integer start_params)
     {
        llResetScript();
     }
             
     state_entry()
     {
        llListen(-20, "",NULL_KEY, ""); 
     }

     touch_start(integer num_detected)
     {
        llDialog(llDetectedKey(0), "Turn on and off", buttons, -20); 
     }

     listen(integer channel, string name, key id, string message)
     {
        if (llListFindList(buttons, [message]) != -1)  
        {
            if (message == "On")
            {
            llSleep(0.3); // needed to kick start the Omega
            llTargetOmega(<0,0,4>,PI,3.0); 
            }
            if (message == "Off")
            {
            llTargetOmega(<0,0,0>,PI,3.0);
            }
            
        }
     }
}

Anyone know a trick? Thanks!