Pretty tricky to get on, my method is I take a 5/64 drill bit and slowly run it through the holes, still gets a good friction fit while being easier to install and remove. Using these with an Aurora cage and getting mid 130s with fangs.
However, one of my flywheels was slightly misaligned and I noticed this after testing. The hole was slightly off center causing the wheel to wobble and make minimal contact with the flywheel cage. Contacted costumer service, I've been told there was a bad batch recently and one somehow slipped into mine. I was sent a free replacement set the next morning as well as a 10% off discount code for my next order.
Had a small problem, Out of Darts wasted no time fixing it, I applaud them for their amazing costumer service from Luke and his staff. Standup company, will definitely buy from again soon.
I have this with the aurora cage and it was a very hard to get on. You should use a hair dryer to warm them up.