If you don't want to reinstall the lumps, put a SAE Grade 8 hardened steel washer under the Allen bolt to spread out the clamping load of the short bolt, and maybe shorten the bolt head to about half its normal height. Just leave enough of the socket head to get a good torque on the bolt. You'll end up with a more free-flowing port than the original with the big pillar in the middle. Then use the lumps for sinkers the next time you're bottom fishing for catfish!

www.ebay.com/itm/155745766417?

LOL!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!