In my opinion, try to work hard with the original parts before you start replacing them. That certainly depends on your personal preference. I find it more rewarding to use the original parts. Of course it takes less modifying and less money too !!
I ended up taking mine apart 3 times before I got it to slide in the right manner.
I had never even seen one before I took mine apart the first time, so I'm sure it can be done correctly the first time by many members.
It is a simple job to remove.
I used fine grit sand paper (carefully) on the bore and the piston. I don't remember the grit (1200? 600?).
I put the temperature sensing device in hot water and took measurements of the pin before and after to verify the function. It all worked as per spec.
BUT, before you start, why not use a hose as a stethoscope to see if you can hear the air rushing when cold and then decreasing sound and eventual stopping when engine warms. If you are concerned you can't tell the difference in sound, like me, you can remove the filter and periodically feel for vacuum with your hand. Please take all the usual precautions when dealing with running machinery.
