Pianotech

You might try shimming between the block and the rim. 
Screws may be hidden under the cloth.
Before you do that,press the una corda pedal and put some card stock between the block and the keyframe. so you can test a few sample notes for alignment.

------------------------------
Ed Sutton
ed440@me.com
(980) 254-7413
------------------------------

Original Message:
Sent: 06-07-2018 17:06
From: Scott Cole
Subject: keyframe rest block help

Greetings all,

I need a little help with a subject that seems to get little attention: re-covering the bass key frame rest block.

The piano is a 1940 Chickering grand. The original issue was getting the hammers in proper alignment. I'm reasonably sure the wippens are aligned, but, apart from those on the ends of sections, Chickering's design has made it difficult to tell--they put a big, thick rail in the way. 

If I assume that the wippens are reasonably aligned, then what I have is hammers that, while aligned to the strings, are all too far to the right and not centered on the wippens. My thought is that felt on the key frame rest block is too thin. It's certainly threadbare. So if I replace the felt, the action will now move to the right, allowing proper alignment of the hammers more too the left, and properly centered on their wippens.

So my question: If I cover the rest block with new felt, what type is recommended? Can I use flange cloth?

Or is buckskin a better material? The original material was glued down all the way across--is this typical, or are some glued on only at the ends as hammer butt buckskin or hammer rest rail felt would be?

thanks again

--

Scott Cole, Registered Piano Technician

Serving Southern Oregon and Northern California

(541)601-9033

rvpianotuner.com

Yu can shim as Ed mentioned. If you want to replace the felt, action cloth. One aspect for alignment is how the ends of the keys align to the underlevers that would be your best clue.

------------------------------
Regards,

Jon Page
------------------------------

Original Message:
Sent: 06-07-2018 17:06
From: Scott Cole
Subject: keyframe rest block help

Greetings all,

I need a little help with a subject that seems to get little attention: re-covering the bass key frame rest block.

The piano is a 1940 Chickering grand. The original issue was getting the hammers in proper alignment. I'm reasonably sure the wippens are aligned, but, apart from those on the ends of sections, Chickering's design has made it difficult to tell--they put a big, thick rail in the way. 

If I assume that the wippens are reasonably aligned, then what I have is hammers that, while aligned to the strings, are all too far to the right and not centered on the wippens. My thought is that felt on the key frame rest block is too thin. It's certainly threadbare. So if I replace the felt, the action will now move to the right, allowing proper alignment of the hammers more too the left, and properly centered on their wippens.

So my question: If I cover the rest block with new felt, what type is recommended? Can I use flange cloth?

Or is buckskin a better material? The original material was glued down all the way across--is this typical, or are some glued on only at the ends as hammer butt buckskin or hammer rest rail felt would be?

thanks again

--

Scott Cole, Registered Piano Technician

Serving Southern Oregon and Northern California

(541)601-9033

rvpianotuner.com