More GRant Steering Wheel Horn problems

[ho70]

Have a 72 tilt column with a olds steering wheel. Bought a classic Grant wheel and the 3163 installation kit. Followed directions and 67-72 links and used the small spring from the signal cancel cam in the grant unit. Horn is always on. Replaced 5 times. Tried Grant spring and same. The contact plate button is not contacting but the horn always blows. Any ideas. It seems the grant 'brass' plunger is too large.