The sides of the bolster can slide through the truck into the bolster creating an interference fit although a dab of glue might be needed.
Once assembled and springs inserted the bolster should be able to move freely.
The bolster is hollowed out so weights can be added to weigh it down.
They come with a suspended break system and fit 33" wheels or smaller.
(Based off of the following wheel models for spacing and diameters: NWSL's 33" inch wheels part numbers 27767-4 and 57714-4)
Bolts, springs, break details have all been added to this model. The journal boxes have been detailed as well and the axle hole has a 60 degrees angle as recommended by the NMRA standards.
Wheel installation: The journal boxes slide in from the side making it easier to install the wheel without having to put pressure on the frame. If the journal box is too tight of a fit the slot can be adjusted with a small file. Pushing the journal boxes into the slot will allow to adjust the left and right movement of the wheel so that they work best for your layout.
The hole in the journal boxes have a diameter of 2.7mm but could be adjusted if required with a small drill. 2 additional journal boxes have been included.
I find they work extremely well with Rapidos 33" wheels but should fit any other wheelset.
Painting FUD/FED use a wax type material for supports when printing. To wash off any residue there are various ways.
I find that a 2h soak in warm water with some dish soap works well. Dry them carefully afterwards and leave them in the sun for a couple of hours to make sure everything is fully cured.
I tend to apply a primer after this (Tamiya Surface primer seems to do the trick) this is great at showing some of the details as well as small imperfections that can be carefully sanded away.
After that paint as normal. I use acrylic paints and chalk powders and finish with a dull coat.