The solid flint wheel can be used even if it has smaller hole diameter. I used 2 bits for glass/ceramic & 1 bit for stainless steel (cobalt tip). After drilling 5 min total ( 3-4 sec drill/ 10-15 sec pause for cooling), i managed to drill the magic hole. In the end, the hole became 5.14mm(my case), just perfect for bi-component glue.
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