1) "Excalibur" - what I named my Double Happiness '08' 7-ply blade ... this blade is from late 1970's or early 1980's - got it used from a friend
I had a DHS factory off-the-shelf model in which I had sanded the bottom of the handle to the way I liked it. This handle facilitated my punch (back in 1980's, this was called a 'push-block') technique. Family pet dog bit the handle one day, and I did my best to mend it. Also, the handle cracked from some smashes or loops and i lost my grip and the racket flew.
In the first pic you can see how much i sanded the wings and the 2nd pic you can see the groove on the bottom of the handle.
~2 yrs ago, after a 30+ yrs break from TT, I started using this again... late last year, I noticed some crack lines showing up and I decided to retire Excalibur.
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2) Avalox P700 - My former backup blade turned main blade after I retired Excalibur.
I didn't like the chunky handle ... much thicker than my preference. In the first pic you can see the wings have been sanded. I believe it's sold this way. I'm not 100% sure as my friend gave me this blade. Because of the chunkiness of the handle, I was able to sand/file/shave some of the bottom of the handle to have a little groove there. I tried both an inverted sheet as well as thin SP... way too heavy for me. This is now my backup to my backup blade.
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3) Nexy Amazon CPen - a gracious gift from Nexy Ambassador/Janitor/Employee Der_Echte as Nexy sent him a CPen mistakenly
I did not sand the wings down to my satisfaction, but have started. The sanded area exposes the darker wooden ply below the lighter wooden ply. I really like the combo of MX-P and the blade for my close to the table play of block/punch/smash/loop (although my looping sucks). I tried another inverted on the backside looking to update my oldschool PH game to incorporate the modern RBP style. Setup too heavy for my wrist and after 2 hours, my wrist/hand hurt. I also tried a thin SP on the backside with an eye towards a possible twiddling game. My wrist couldn't handle the weight of that setup also. Currently have a LP OX on the back but have not tried to incorporated LP tactics into my game.
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4) Currently am using the prize I received from NextLevel's Christmas contest, an American Hinoki CPen with 2 Tenergy FX-80, to learn RPB.
This is shocking to me as my wrist
CAN handle the weight of the 2 inverted. The AH is noticeably smaller. In the 1st pic and 2nd pic, it may not be as apparent at how much smaller the blade is compared to the other CPen blades I've used but it is evident if you held the blades in person.
1st pic - L to R = DHS 08; Avalox P700; Nexy Amazon; AH
2nd pic - AH laid on top of the Nexy
I am not crazy about the thickness of the cork handle of the AH. It's slightly bigger than the chunky handle of the Avalox. I have not decided if i want to make a groove in the bottom of the handle yet.
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5) My advice is to be gradual when you started sanding the wings
I used a file to start. Once it's partly sanded down, I play with it and find if it's comfortable or not. If it needs to be filed down more, I will file again. If it's almost right, I will use sandpaper to smooth it out. But it's a gradual process to find my comfort level.
If you sanded/filed too much of the wings, you can get 'plastic wood' and add some back as you can see from my DHS 08. But I find it easier to sand it down slowly vs adding plastic wood back to rebuild.
Hope this helps you in sanding the wings down on your blade!