Credit for this whole page belongs to Christian Iversen in Denmark. Through the FDP he shared his experience of installing Fender tilt-back legs.  He writes

"I got the 14" set for this amp.

Both my amps have the reverb tank mounted on the side, so these numbers should keep you from drilling into that.

First hole is for the pivot screw. I measured 13,5 cm from the top of the cabinet and 6,0 cm from the back of the cabinet. I used a 5,0 mm drill. On the outside the pivot screw goes through the leg, through a washer, into the whole you just drilled and on the inside you put another washer, a stop washer and the stop nut. I used a an adjustable spanner and a Philips #2 screwdriver for the tightening. Don't be a dork like I was for the first 20 seconds of tightening; use the spanner to fixate the nut and tighten using the screwdriver, not the other way around, duh!

For the stop I measured 11 cm from the top and 11 cm from the back for a nice square feeling I guess. The screw for the leg stop won't go through the wood, but pretty close. I used a 3.3 mm drill for this whole. Drill about half way through the side of the cabinet and as you tighten the screw you'll hear the wood crunch a little, mmmmmh :)

Repeat, tilt back, plug in, play, all is well."

His excellent series of YouTube videos, showing the whole operation, begins here. There are four in all. Christian is more than just an amp geek - you can catch his soulful playing here on a PRII (solo begins at 1:10). 

I would add that if your reverb tank is mounted on the side wall, now would be a good time to move it to the base of the amp; and an alternative approach to tilt-back legs is the Foam Donut, although the two ideas have slightly different goals. 

Once again, many thanks to Christian Iversen and indeed to everyone on the FDP's PRII thread.

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