I have to agree too, & I'm not even a bowling veteran! Besides, wooden approaches are far easier to maintain than wooden lanes, (they only took my boss & my self a couple of hours total to resurface & recoat) so from a propriorters point of view, sometimes it might make sense keeping wooden apps.
Roysa, the reason it probably dooesn't hurt whilst bending up & down on your knee 20 times in a row is because you're right, it is a chain reaction caused from the weight of the ball throughout your entire shot! Like, its one thing putting weight on your thigh, but putting weight on your thigh plus throwing a 15 lbs ball increases the ammount of pressure by quite a lot, take out the sliding buffer, & its increased even further! big pain in the ass (literally) does deep heat really work that well? I haven't tried it on my thigh, but I have used it on other muscels with not so much success