DN NA Class

While getting the boat back together after two seasons off I found one of my chocks to be bent.

A few years ago I switched to cutaway struble chocks.  They are glued to my plank. While shimming one of my runners I found that it was rocking back and forth in the horizontal axis.  After some experimentation with some 1in aluminum angle I have found that a 1mm crown is present.  I have attached a picture. 

Has anyone else experienced a bent struble chock?

Any input on how I should fix it or what to do next would be helpful.

What to do next?
1. Don't worry about it.
2. Replace with new chocks and reglue.
3. Have it machined straight and reglue.

Thank you,

Rob Linden DN 5174

Where's the picture?

Chock photo

Chock Photo 2

I straightened some Sarns chocks , not as beefy as the Struble but may work.
I put a bolt through the center with nuts on inside against both sides inside of  the chock or you could use some kind of block .  to keep that dimension, and used large Machine clamp  and  brought both outside edges back to same dimension as center .
Or you could just shim the inside of the chock fo a quick fix

Bob Rast
DN1313

You might want to check your other chock with a micrometer, the center of chock is sometimes wider so runner only touches outside edges of chock.  A large clamp should work just take your time  and check as you go .

The other chock is straighter but still not as straight as my old sarns chocks they replaced.  The middle section by the bolt is the tight spot in the chock.  This allows the runner to wobble back and forth.  I have only sailed on them a half dozen times or so since putting them on the plank. 

I think I may be able to straighten a sarns chock but the web design of the struble may be tough.

Thank you for the help

Its aluminum already bent once might as well try to straighten , experiment on the Sarns   I think  the center should be slightly wider than ends or the same ,Ill check my extruded chocks
and see what they are

You could just shim that side of the chock with some shim tape

Sorry if this is totally irrelevant. My Iceflyer really mangles Sarns chocks. Also, I never could solve the aluminum on aluminum wear issue on the Sarns runner stiffener.  I went with soft steel with a much larger base (nine through bolts).  A season of abuse will result in a slight splay, which I fix with about five minutes of vice work.  Local welders make these for about $30/pair.

If you decide to replace your chocks, I highly recommend Wes Wilcox's milled chocks.
He has an ad in Runner Tracks: http://runnertracks.org/2013/winter/Runner%20Tracks%20Dec%202013.pdf#page=13

Saw those at the swap meet looks like a great product

Bob Rast
DN1313

I will probably try the shimming idea once I have some time available in the shop. 

What glue do you use to attach the shims to the runner body?

I've used superglue with fiberglass/epoxy shims, and now I use double-sided tape with plastic shim stock.

All the energy of you and the boat tries to go straight when your runner is caught in a crack. Something has to give. The advantage of glued chocks is persistent alignment. This is one disadvantage.
I recommend new chock here.

RLinden I tried your email address on the DN registery but it came back. Send me your email and I'll send you an article I'm working on for a fix. My email is bgray4654@ yahoo.com