Old Triang/Hornby stock

Does anyone have any experience with upgrading old Triang coaches to modern wheels? I've done everything that has wheels with the 'clip in' pinpoint bearings, but what to do with the very old stock that has rounded end axles with 'open' axleboxes? My DMU is like this, for example. Also some more recent Hornby stock has the 'chrome' wheels that have tyres that tend to work loose - these also have round end axles but in closed axleboxes.

 

Have you tried 'top hat' bearings.

New Railway Modellers Forums - Model Railway Discussion Forum For Beginners • View topic - Tri-ang Coach wheel issues

 

I've tried the Peco nylon bearings, but they're too big and I can't see how I would be able to enlarge the hole and keep it correctly centered. Also, has anyone a good method for getting the old wheels out without breaking anything? (I've tried a couple of scrap coaches with sometimes alarming results!)

 

A lot more info can be sourced here:

Which size of wheels - Model Rail Forum

Also these are top-hat bearings:

Romford OO Wheel Bearings Brass Shouldered (JR14) | Antics Online Model Shop

 

Thanks very much - that seems to contain the information I need. Will try and follow the recommendations there.