My BJ Trailers Minno Shuttle is nigh on 20 years old, unused for at least five years so in preparation for use an mot (called an Expertise here) is required. In fact rather glad it is because:
the hook/coupling rattled a bit as usual, since I have two of these so can compare, a bit of rattle seemed perfectly normal.
Turns out in this case it is not.
I will add a video link shortly to show how you can test it with one hand, but suffice to say the coupling itself is apparently worn.
Must say I have begun to wonder about the life of this one before I bought it, totally hammered springs to mind. That said given it's age I was expecting to renew ALL moving parts, just that the coupling I never thought of, the lock yes, but the head itself no.
Anyone else had this? Suggest you check first...
It's a Knott.
Testing a good coupling
and the bad:
there is no movement possible pushing with one's hand, with the bad one there is a lot.
Having something to compare makes a big difference in determining if there is a problem.
for younger viewers these now obsolete trailers were designed specifically around the 7 and to fit in a single domestic garage.
these two trailers are the same vintage, the "bad" I bought used quite some years ago now. The good I have had from new.
edit to add:
The first one, with snow in the background, is the "good" hitch and when you press the back of the inside of the coupling, with the mechanism closed as if for towing, so the default position, there is no movement whatever when you push backwards
The second one is the "bad" coupling where doing the same thing you will feel and even hear if you do it fast enough much movement in the back of the inside of the coupling, also the handle goes up and down, but that's just a bonus because it always does that if you pull it anyway.
When you put your hand in you will feel the correct bit to push.. (i.e. you need to be there ;-) )
The BrianJames Trailers item code is S-COHD-5104-P-N and commodity code is 87169090 £83.74+vat and carriage will be expensive because it is heavy.
For Coupling-Head, Knott-Avonride, Type 2, 2700Kg, 12mm bolts. It includes the integral lock and key.