blanking unused take offs

Hi everyone,
I was just wondering what's the best way to blank off all the unused vacuum take offs on the manifold.
I currently have silicone hose joining them but want a neater more permanent solution.
Would aluweld or liquid metal(the filler) be up to the job or would it be better to drill and tap the holes and use bolts.
Thanks Andy.

Easiest is to use the std volvo bungs, still there for use at later date then. Could drill and tap, remove and ali weld or just fill them with areldite.

id tapp and stick a noce bung in, chemical metal could come out and go into the engine :crap: