Well, that would be some record sundae!
And is there no way to avoid clog? Use lots and lots of WD40? I still have some quality synthetic cutting oil left as well.
And what are my options for drilling out the 'barrier'? Can I use carbide oval burs for that? Like :
http://www.ostartools.com/products/f...eburs/oval.htm
The hole saw I have are:
http://www.holesaws.com.cn/products/...saw/hsssaw.htm