I've crimped about 300 of these buttons for a number of Arduino projects over the past few months. In terms of quality, they are a bit rough (sometimes mutilated from the bag) but still work well, but for the price that's no problem at all. My only complaint is that they are too tight in the packaging, making them extremely difficult to remove later. However, if you swipe it open a little and drop WD-40 on the connector, the problem is solved.
π Molex Micro-Fit 3.0 Dual Row (4 Circuits) Receptacle Plug Set, Male & Female with Terminal Sockets, Pack of 5 Sets
5 Review
TICONN Connectors Waterproof Automotive Electrical Electrical
4 Review
π Baomain 6.3mm Crimp Connector Terminals: Female Spade Quick Splice, Non-Insulated (100 Pcs)
7 Review
π 300Pcs RockDIG Wire Ferrule Crimp Connector Kit - 8 Sizes Assortment, Tinned Copper, Electrical Cable Pin Cord End Terminal, for 12 10 8 6 4 2 1/0 2/0 Gauge Wires
5 Review
π‘ Electronic FL Ballast ICN-4P32-N (Formerly ICN-4P32-SC) for 3-4 F32T8 F40T8 F17T8 Lamps, 120V/277V Compatibility
5 Review
π Robertson 2P20132 Quik-Pak: 10 Fluorescent eBallasts for 2 F40T12 Linear Lamps, Preheat Rapid Start, 120Vac, 50-60Hz, Normal Ballast Factor, NPF, Model RSW234T12120 /A (Crosses to RSW240T12120 /B)
4 Review
Wireless Electronic Ballast Interface Certified
8 Review
Fulham WorkHorse WH2-120-C Adaptable Ballast - 2 Pack
3 Review