MR-12 Seat

[technidiver]

The other day, several memebers of the forum were discussing the seating material used in Voit seats. Today, I opened up my MR-12 and saw why it had an HP leak. As Jay told me, the seats crumble and crack and start to degrade repaidly. The seat is missing most of its original material. I'll make a Flickr account and post a photo later to validate the claim that Voit seats were made of black crayola crayons LOL

Now, this brings me to my next topic. On TSM, Rob is selling balanced two stage seats that work in the Ram and Trieste. On VDH, the conshelf seat works for both the RAM, Conshelf, Trieste, and MR-12.

If TSM has a seat that works for the Trieste, and the conshelf seat on VDH works for the Trieste and MR-12, will the TSM seat work on the MR-12?



TD

[nikeajax]

Firstly: holy cow boy, ya finally got yerself a Flickr account--will wonders never end?

Secondly, see, I told you so! A USD seat will work perfectly, you just need to get another push-rod/pin. Measure the Voit seat and rod together then trim the new rod appropriately: beg, borrow or steal a mic so that you can get as close as possible to the original length

Finally, change that o-ring!



Jaybird

[technidiver]

Mar 8, 2019 10:47:59 GMT -8 nikeajax said:

Firstly: holy cow boy, ya finally got yerself a Flickr account--will wonders never end?

Secondly, see, I told you so! A USD seat will work perfectly, you just need to get another push-rod/pin. Measure the Voit seat and rod together then trim the new rod appropriately: beg, borrow or steal a mic so that you can get as close as possible to the original length

Finally, change that o-ring!



Jaybird

Let's just say that today is Day 1 of March Madness! I have more planned, gonna post some photos on flikr and get them here to show the collection!

Yup, got the O ring changed and used a small amount of spit to get it in. Fits like a glove.

I'll try to find another rod in my travel. If all else fails, I've got VDH as a backup.

TD

[herman]

For all of those regs, there were 2 different seats used (excluding plating and/or sealing material). Externally, they are all the same (except plating and seat material). The only difference is the pin hole depth so you can use any USD/Voit balanced seat in any of those regs but you MUST have the correct pin length to go with it. Back in the day, Voit sold the seat and pin as a set so you would have the correct pair.
If I remember correctly, with the seat, pin and pin support (mushroom) assembled, there should be about 0.040 clearance between the bottom of the pin support and the face of the reg/nozzle. When pressed in the pin support should just bottom out, leaving no gap.

[vance]

I wouldn't buy one of the NOS seats. It'd be better to use the newer type, even though the pin needs to be modded. Get the conshelf pin, too. Go to Harbor Freight and pick up a digital caliper for $10 on sale.

[nikeajax]

Yes, quite defiantly stay the h3ll away from those NOS-seats! Do they have "Horror Fright" in the Great White North? That might be the only thing I'd buy there though, not even a screw driver: their stuff is stinky doo-doo-ca-ca

JB

EDIT: my buddy that's the machinist at UC Berkeley got me calling it Horror Fright

[herman]

You can't just get a conshelf pin. That will work in a conshelf but the dimensions of the other regs/nozzles is different which will require a different length pin. While on the subject, you can't just use any old piece of steel for the pin. These are hardened pins to prevent bending and their diameter is somewhat critical as they fit inside HP seat. The best way to replace an unknown pin is to get one of the later pin pads for AL regs which do not use a larger head and 1 inch SS hardened pins which you can cut to size as needed.

[crabbyjim]

Mar 8, 2019 10:47:59 GMT -8 nikeajax said:

Firstly: holy cow boy, ya finally got yerself a Flickr account--will wonders never end?

Secondly, see, I told you so! A USD seat will work perfectly, you just need to get another push-rod/pin. Measure the Voit seat and rod together then trim the new rod appropriately: beg, borrow or steal a mic so that you can get as close as possible to the original length

Finally, change that o-ring!



Jaybird

One day soon I’ll have to get together with you and/or Phil so that you can walk me through this.

[technidiver]

Heres the Crayola seat. It's not the best quality (as good as a phone can do) but you can see the seat is partially missing and brass is showing. No kidding it's leaking when a chunk is missing!



TD

[nikeajax]

Seeing as they were a rubber company first, I cant help but wonder if they had reformulated the teflon trying to make it more, um, well, I d'know, rubbery? Gee-whiz, maybe it's Gutta-percha:

en.wikipedia.org/wiki/Gutta-percha

That's a joke son... But did you know that the famous Old West lawman Bat Masterson had special grips made for his pistols from gutta-percha?

JB

[tomcatpc]

I think my Colt Police Positive from 1910 has grips made of Gutta-Percha?, or just plain old Bakelite?
Mark

[vance]

Mar 8, 2019 14:46:11 GMT -8 herman said:

You can't just get a conshelf pin. That will work in a conshelf but the dimensions of the other regs/nozzles is different which will require a different length pin. While on the subject, you can't just use any old piece of steel for the pin. These are hardened pins to prevent bending and their diameter is somewhat critical as they fit inside HP seat. The best way to replace an unknown pin is to get one of the later pin pads for AL regs which do not use a larger head and 1 inch SS hardened pins which you can cut to size as needed.

Isn't the conshelf pin long enough to cut to the correct length? 

[herman]

I really don't know, my guess is no. I would have to measure them to be sure.