The post on the cap fits into a slot on the gas cap door

 

+1
Ron

 

Kind of.... it doesn't sit in very deep, at least mine didn't, less than 3/16" which felt unstable. I pushed it in too far one time and that caused mine to spring into 4 pieces when i pulled it out... i got it back together and later drilled the hole out to a bigger diameter so that it now sits much deeper with no chance of falling out and easily pulls out without getting stuck. Its soft aluminum and easy to drill out with a hand drill. (I was a machinist in an earlier life... so i dont hesitate on that sort of thing)

 

+1 I did the same drill out the hole.

 

As to bit size I used a 23/64" (9mm) bit and allowed a bit of a wobble to match the progressive change from .890mm to 9.30mm. Then chamfered the opening with a 45deg bit.

 

Definitely drill the hole larger. If you continue to make it fit in the tight hole one day when you are not paying attention the bottom of the gas cap where the post is will stay in the slot and the nice little spring and spring retainer in the cap will find its way down the fill spout into your gas tank.
(guess how I know this)

 

Careful drilling out that hole. Place a rag under a piece of wood to catch that bit before it ruins the fender.

 

I just stick it in the hole, it's not going anywhere unless you bang it hard enough, but when you pull it out make sure to grab the whole end of the cap so you don't put pressure on the parts that pull apart.


Has anybody tried to just sand a little off the post instead of drilling out the hole?

 

That's what I did.

Or bring your better half to hold gas cap while you fill the tank...