Wepster

@SUP I think the ruler is metric, the one is a centimeter, his first post showed them 8mm wide (or long, or left to right).

@SUP other way around, the ones he wants are thinner, smaller, the 2 in the pic. He says easily bent by hand.

Good information, thank you.

@SteveOz well?

Seems like belt keeper staples.. https://www.amazon.com/Leather-Staples-Fasteners-Holders-Leathercraft/dp/B072M2H6JF https://www.springfieldleather.com/Staple-Belt-Keeper-10pk https://www.amazon.com/Tandy-Leather-Staples-Stainless-1279-00/dp/B013PW4QUY https://www.amazon.com/Bluemoona-100-Pcs-Leathercraft-connector/dp/B0719H615Y/ref=pd_lpo_sccl_1/139-0300067-3801120?pd_rd_w=AgMm1&content-id=amzn1.sym.1ad2066f-97d2-4731-9356-36b3edf1ae04&pf_rd_p=1ad2066f-97d2-4731-9356-36b3edf1ae04&pf_rd_r=PM42F0N58XKW3J1YBFQ3&pd_rd_wg=dxlOK&pd_rd_r=b06fbde9-ccec-4390-acdf-757b21374f0e&pd_rd_i=B0719H615Y&psc=1

Nice! Did the thicker foam work for you? Or would a bit thinner be better?

@Bert03241 please, I would like to know how it works out for you, and any hints for using it.

What thickness of foam? 2mm?

May I suggest reaching out to your friends who may have a similar sized weapon? or even a gun shop, then perhaps you would be able to find a pattern for the pistol that closely resembles your Byrna.

These pliers might be helpful when reducing the post...(I got nothing if you get these). I bought these, there are others out there.... https://www.amazon.com/gp/product/B002L6HJAA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

just musing, I wonder how cork "leather" would work as a stiffener? https://www.google.com/search?q=cork+leather&oq=cork+leather&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIGCAEQRRhBMgYIAhBFGEEyBggDEEUYQdIBCDM3MTZqMGo3qAIAsAIA&sourceid=chrome-mobile&ie=UTF-8

@Shadders those cheap wood carving tools I linked to are not great, BUT, the straight "chisel" can be easily ground or filed to your desired width, same with the V gouge. Those things are cheap Chinese, so ali express, or one of your local hobby shops or inexpensive tool stores probably has a set. Here is a link, again shows shipping to US, do not know to you, or your VAT or import taxes. https://www.aliexpress.us/item/2255799842652071.html?spm=a2g0o.detail.pcDetailTopMoreOtherSeller.4.626e19c7tm4U6O&gps-id=pcDetailTopMoreOtherSeller&scm=1007.40000.327270.0&scm_id=1007.40000.327270.0&scm-url=1007.40000.327270.0&pvid=2c0860b8-d0f4-41b7-80ce-343845152b2f&_t=gps-id:pcDetailTopMoreOtherSeller,scm-url:1007.40000.327270.0,pvid:2c0860b8-d0f4-41b7-80ce-343845152b2f,tpp_buckets:668%232846%238116%232002&pdp_npi=4%40dis!USD!8.15!7.65!!!58.45!54.86!%402101e62517110121667631756e7e1e!12000027302796103!rec!US!3960785007!&utparam-url=scene%3ApcDetailTopMoreOtherSeller|query_from%3A&search_p4p_id=202403210209268021401770410937712499_3 Enjoy your journey in leather!

Also, there are 1mm carving (wood) chisels, and you might find a 90 deg V carving tool that is 1mm. There are cheap little carving sets that with a file and perhaps pliers you could make the small chisel into 1mm, and the V into a 90, and 1mm This showing shipping to US, don't know your shippling cost https://www.amazon.co.uk/Modelcraft-PCT1006-Carving-Sharpening-Stone/dp/B01N5XWO2J/ref=sr_1_17?crid=1CGMLX9O8DCWI&dib=eyJ2IjoiMSJ9.Gy29Pv1ByDLpq-CzknxKaf-NSHEmw8MmqjUNii8zdTn56doehZrr14FdCJtXwKre750J0JMumETdbXShGZh53FZbhdx_YfVN529ETdllKW7WPKhHNma70fwVWI_rv0CzYfJJC-waAMxowFRfV_nXxCK7y6sGy1oDVx_eJf1x4XWeZttZQBzS3aL9IB9yWRayMzu8ACO0mUaeho7WVGIDttM44aj_nG-lzLTH8Y2GfgiO8uaYNdjChWpgVIqxS2gzF_sI78Sh5ELgaZVv7OuprM74NKNqIXTMvqOvDFOZqj4.ltPF-oA07Ep_MRbakZvHNS_zQKAujiDTxiMnQYObGEk&dib_tag=se&keywords=wood+carving+tools+set&qid=1710934364&sprefix=wood+carving+to%2Caps%2C225&sr=8-17

This is etsy here, so maybe not useful to you in the UK, but google square hole punch... too simple, right https://www.etsy.com/listing/1314234785/square-hole-steel-punch-1-2-3-4-5mm?gpla=1&gao=1&&utm_source=google&utm_medium=cpc&utm_campaign=shopping_us_d-craft_supplies_and_tools-decorations_and_embellishments-studs&utm_custom1=_k_CjwKCAjw7-SvBhB6EiwAwYdCAT74rsfOOVtv5e_kEflPSuEm8MaVb0-vsAYph08pwuwGkv15u7npIRoCqKcQAvD_BwE_k_&utm_content=go_1843970773_72423993831_346362959505_pla-295472670707_c__1314234785_12768591&utm_custom2=1843970773&gad_source=1

https://kamsnaps.com/collections/open-ring-metal-snaps