You can get a coaster to fit by putting Self Amalgamating tape on it, just build it up a couple of turns this allows the coaster to bite into it, I had it on mine and it worked really well.
Hope this helps.
HW 77 V glide kit by Steve Pope
8-40x56 Custom Shop.
HW 101. Big Nikko. Ginb FT Stock.
Webley Omega, Gas Ram.
Rohm Twinmaster Trainer.
Red Dot Sight.