+1 Been using Veloplugs for years with no issues ...
https://veloplug.com/ When I put in Veloplugs I push them in with the smooth handle of a screwdriver so that are in flush and tight .... also for insurance I put a dab of tubluar mastic on them too.
They provide more room for the tube and make changing the tire easier.
I am waiting for someone to make semi-permanent 3M adhesive stickers with a firm backing to replace them ...... someday.
They would go on easier and be even smoother inside ..... and be lighter than Veloplugs.
have used various brands of latex ... using Vittoria now
http://www.wiggle.com/...ia-latex-inner-tube/ Works well and has a removable valve for when using with extensions.
Cheers, Neal
+1 mph Faster