Topic: Valve Lapping Tip - No More Chewing Gum

[bahia]

I've heard some people resort to chewing gum to get the suction cup to stick to the valves while lapping.
Being a fine art photographer, and hanging as many photographs as I have over the years, I know of this stuff called "Picture Putty" or "Museum Putty."
It helps keep frames from shifting on the wall. (It tends to happen in California a bit  ).

It's the same consistency as chewing gum, but you don't need to get a sore jaw from chewing so much.
A pack from Home Depot will run you $5.
Wad it up into a ball, and press onto the valve really good.
Works a charm!

[Don R]

 That looks like permagum, duct sealer which would probably also work.

[bryanj]

I think Bostix blue tac(or white tac) is the same

[ekpent]

 A mechanic friend helped me out on a 750 head one time and we used his favorite paste with a cordless drill turning very slowly with the valve end chucked up with a stiff rubber tube. Seemed to work well. There was a little technique to it and not a full on hard bore spin job.