DIY Grommets for Thermometer Probes


 

Jim Rogers

New member
This is how I solved the thermometer probe poblem. I am new to TVWBB, so please accept my apologies if I am "reinventing the wheel".

Don Cash sent me info about the BBQ Guru grommets in response to a post I made on the new user forum. They looked good, but I wanted to have my WSM ready in a few days, so mail order would not work.

I looked again at TVWB site and read the "More Thermometer Installations" page more carefully. In particular, I looked at the "Middle Cooking Insert" and "Middle "Cooking Section Probe Thermometer Eyelet" entries.

I headed to Home Depot (without writing anything down) to look for some hardware that might work. On the plumbing aisle, I found brass inserts for compression fittings. I got a 1/4" OD insert, headed for the fastener aisle, and got a 1/4" E clip. I headed home, and discovered that the Maverick "smoker" probe is almost 1/4" OD.

Not yet ready to admit defeat, I went back to HD the next day and purchased 3/8" brass compression fitting inserts and 3/8" E clips. At home, I found that both Maverick probe bodies were small enough to fit in the 3/8" inserts, but the curve in the meat probe was a problem. I used a tube cutter to cut down one of the inserts to roughly 1/2" length, which allowed it to fit around the bend of the meat probe quite nicely.

Only one problem ramained. While both probe bodies fit nicely, the crimps at the top that hold in the wires cause the tops to be too wide. I used pliers to push down the two sides that stuck out too far, essentially partly "uncrimping" the probe. The probes then fit through the inserts very smoothly.

I decided to replace two of the bottom bolts that hold the bottom rack and water bowl holders with the inserts. My reasoning is that while the top bolts are in tension, the bracket should be pushing in toward the bottom bolt.

I put the inserts in from the outside, keeping the washers that come with the bolts. I then discovered that a 3/8" E clip is too big for a 3/8" OD insert. (???) Fortunately, I still had the 1/4" E clips from my first HD run. These fit perfectly!

I put the inserts in from the outside (they are flared on one end), using the washers from the Bolts. I then put the E clips on the inside to hold the inserts. They have worked great for my first smoke!

Here are a couple of photos. One is of the inside, showing the cut off insert and the E clip. The other is of the outside, showing the access door, top bolt, and brass insert at the bottom.

http://i884.photobucket.com/al...PhonePictures084.jpg

http://i884.photobucket.com/al...PhonePictures086.jpg
 
Wow Jim,
Very clean installation. Looks factory made.
Weber lurkers (we know your out there) are you paying attention?
 
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Mac McClure:
Wow Jim,
Very clean installation. Looks factory made.
Weber lurkers (we know your out there) are you paying attention? </div></BLOCKQUOTE>

Thanks for the compliment Mac!

If there are Weber lurkers out there, I would suggest a slightly larger diameter, so that a Maverick probe would fit through easily without any "modification". I would also suggest either devising a plug (maybe just a bolt to insert) or providing an alternate "blanking" bolt for the folks that could not tolerate a small "leak port".
 
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Robert Clark:
Why did you decide to put the eyelet in near the bottom grate? </div></BLOCKQUOTE>

Robert,

I just thought of it as a statics problem. Sorry if I am talking like an engineer. Since the brackets that hold the water bowl and middle rack have both of those downward loads on their side toward the inside of the grill, and the bolts on the outside are reacting against those loads with an upward force, the bracket should have a rotational moment that would make the top of the bracket rotate toward the center of the grill. The top bolt would react against the rotational moment, putting it in tension. The area around the bottom bolt will therefore be in compression. The sidewall of the middle section also helps with these loads, but will not reverse them.

With all that said, putting the inserts in the top holes would probably work, but putting them on the bottom makes me much happier.
 
One more reply to myself...

Total cost of the brass compression fitting inserts and E clips (both come in 2-packs) was about two bucks. If you have to buy a tube cutter, it might be cost effective to go ahead and buy the BBQ Guru grommets.

Using the tube cutter on such a short a piece as the insert was a little difficult, but doable. The flared end of the insert served as a guide and a grip for rotating the insert. You have to use the flare tool after making the cut, as even the brasss curls inward some.

The clips have held on for two smoking sessions, but it looks like I will have to push them back on fairly often. That should be fairly easy to do. I imagine that they will loosen over time, I'll have to see how quickly. Perhaps I could flare the ends of the inserts to provide a stop for the clips.
 

 

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