1928 Thompson cocking bolt

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Lord Elpus
Fought at the Somme
Fought at the Somme
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Joined: Fri Sep 16, 2016 9:48 pm

1928 Thompson cocking bolt

Postby Lord Elpus » Mon Oct 08, 2018 2:29 pm

Having not touched this Thompson cosmetically, I thought I would put the bolt in the correct place, so first step done, marked out and cut slot, now to look for suitable piece to make a slotted bolt handle/head as per original. I will probably make it from aluminium bar, I did have some knocking around, the hardest job is finding it!
Andy
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Lord Elpus
Fought at the Somme
Fought at the Somme
Posts: 779
Joined: Fri Sep 16, 2016 9:48 pm

Re: 1928 Thompson cocking bolt

Postby Lord Elpus » Wed Nov 21, 2018 9:38 am

Have got around to doing a bit more to this conversion, was going to make it eventually an “ebb” conversion, but at first wanted to just do a swop over from side to top fake bolt runnning action.
Now I knew there wasn’t going to be a lot of room along the top........but there is in fact none at all! So I’m hoping when the “ crimp strip” is removed from the top of the gearbox there might be enough room to put in the original slide plate, I may have to take some material out from the inside top of the receiver, but if I’m going down that road I’m going straight in for the ebb conversion, this means machining down the top section of the gearbox.......so it might end in disaster, but I do have a couple of gearbox cases sets spare, they happen to be the same as the P90 (if you didn’t know).
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Lord Elpus
Fought at the Somme
Fought at the Somme
Posts: 779
Joined: Fri Sep 16, 2016 9:48 pm

Re: 1928 Thompson cocking bolt

Postby Lord Elpus » Mon Mar 18, 2019 2:45 pm

Just a quick update, on this, used original “side slide” plate, bit of a chop down and repositioned the spring all fits together ( with a few Anglo Saxon expletives) is quite short on pull but I want to make it work with the gearbox later, so didn’t want to cut too much from the plate, but for the working on “fake bolt action” could be cut down a bit more for longer stroke/ pull.
I see this as “ stage one” on this modification, so if anyone wants to try it or want me to do it, let me know. There’s a bit more smartening up to do will post finished pics.
Andy
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Lord Elpus
Fought at the Somme
Fought at the Somme
Posts: 779
Joined: Fri Sep 16, 2016 9:48 pm

Re: 1928 Thompson cocking bolt

Postby Lord Elpus » Mon Mar 18, 2019 2:47 pm

Pic’s didn’t come out in order(when do they ever!) but middle pic shows spring just tucked up inside.
Lord Elpus
Fought at the Somme
Fought at the Somme
Posts: 779
Joined: Fri Sep 16, 2016 9:48 pm

Re: 1928 Thompson cocking bolt

Postby Lord Elpus » Wed Mar 20, 2019 7:13 am

A couple of pic’s of the trimmed and adapted slide plate to fit,
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Lord Elpus
Fought at the Somme
Fought at the Somme
Posts: 779
Joined: Fri Sep 16, 2016 9:48 pm

Re: 1928 Thompson cocking bolt

Postby Lord Elpus » Mon Mar 25, 2019 5:52 pm

Did a bit more today, slotted top of g/box case and same to piston, it looks like this will work, but I’m thinking the thin slide plate won’t stand up to the job for long. I don’t want to take off anymore from the top of the g/box, so as to fit a thicker plate. So I’ll be looking to machine down thickness of top receiver, all that’s needed is maybe 1 mm.
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