I drilled and tapped my swingarm for DP Hugger last week.
Make sure that you use a brand new drill and tap.
I centre punched the hole location after positioning the hugger, then used a 2mm dia "pilot" drill followed by a 5mm dia start drill. I then tapped with an M6 x 1.0mm pitch tap. All went well and hugger is snug as a bug and doesn't flap around like a flappy thing.
Better than bodging it with velcro or sealant!!!
R X