TEVO 4wheel TITAN Carriage

Very strong carriage, uses 4 Perlin wheels instead of three and is very close in design size to my three wheel carriage but this one is a tad stronger & heavier design but simplistic. I did use this carriage on my current printer and does work well but ieventually upgraded to the 8 wheel for larger application, M4 alan bolts for all the hardware as usual.
I also started tapping the M4 bolt holes in the plastic, sometimes the plastic would gaul up around the bolt threads and