Different coupling height

[DRS]

Can anybody help. Some years ago whilst in Florida I purchased a loco and four Norfolk and Western spectrum coaches. On return to the UK I decided to purchase an observation car and baggage car. However the coupling height on the later two have a slightly different height. There no loose parts but the construction is slightly different. Strangely the observation end mates the original coaches.
Does anyone have a useful suggestion.
Many thanks.

[Trainman203]

Google is your friend

http://mrv.trains.com/basics/basic-training-series/2013/05/basic-training-adjusting-coupler-height

[Terry Toenges]

That video doesn't load.  It says Video Plus is a subscription site for $4.95 a month.
Here's a couple more that don't require subscribing -
https://www.youtube.com/watch?v=JL1V1Q71mBs
https://www.youtube.com/watch?v=RauSgtoocGE

[Trainman203]

That's odd.  It let me in.  Although I do subscribe to MR.

[Terry Toenges]

I don't subscribe so that's probably why. I'm guessing it comes automatically with your subscription to MR.

[Trainman203]

Terry I looked at your video links and they are great.  Once there, there are other good ones by the same guys.

[DRS]

Hi folks
Interesting info but I have 3 axel bogies with no underneath screw fitting. The coupling is linked internally to the bogie and hence turns on courners.
The coupling is in a ,box, which is thicker on one. There appears no way to remove this. To dismantle the whole body to get internal access seems somewhat difficult without causing damage.