Quoted from Mr_Outlane:
I was just looking at them (Cliffy's) for that reason!
I always figured hole protectors were not necessary until they were worn. Why cover the rim when it looks good? But I do like to protect the shooter lane straight off.
When removing the ramp, DO NOT pop the sensors off the ramp. Unplug the sensor connectors from the board underneath and label them and pull them through the playfield. Be careful when handling. Drill pop rivets out, install new flaps and reverse process. These sensors are just stupid ridiculous to try to get to snap back on.
If you're going to do a set of Cliffy's, do it all at the same time. Cliffy's absolutely suck ass to install on this machine (specifically Balin). You'll swear so much you're neighborhood priest might bust down the door yelling "the power of Christ compels you". DO NOT play your machine for 24 hours after. Let the adhesive setup/cure.
And lastly, while the ramp is out REPLACE ALL RUBBERS and make DAMN sure both hole backstops are tight and the posts in the pop bumper area are also tight.