Momo Steering Wheel Boss Woes

Momo Steering Wheel Boss Woes - please help

February 25, 2026, 04:55:25 PM

Hey folks,

I bought my 89 Mk2 Gti years ago and it came with a Momo steering wheel fitted, the boss used was for a small spline Mk2. The previous owner had removed the small>large spline adaptor in order to fit it. Ok cool.

I added the adaptor back in and fitted an original steering wheel maybe 5 years ago.

Last week I picked up a Momo Master steering wheel and figured I could just use the old Momo boss that I had in the shed, and so I removed the small>large spline adaptor again, and now when I have fitted the boss, the silver horn ring and base of the boss in general is making contact with the steering column housing, meaning that the horn is constantly on.

Now, I thought perhaps I'm meant to use a small spacer between the back of the boss and the steering column, but there isn't a flat surface for the spacer to butt up against. The column does the following: Threads>Splines>taper

So the only option would be to fit some sort of tapered spacer, which makes no sense.

Am I missing something? Would love some help. Thanks in advance!

Re: Momo Steering Wheel Boss Woes - please help

Reply #1 – February 26, 2026, 06:56:11 AM

Do you have a multimeter?
If so, take the boss off and measure continuity (resistance) between the ring at the back of the boss and its chassis. If you have 0 or very low ohms, your issue lies in the boss and not the method you're using it to fix to the car. It's entirely possible something has moved in the boss and is constantly earthing out the horn push wire.