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I've heard of 'transferable skills' but that is something else !!! 🤣🤣

You'll probably get a much wider choice if to look n eBay and/or Amazon. You may even find a catch which is all brass without a ball or roller which relies upon spring tension.

Use a Brass version with Stainless ball/roller. There are many versions available.

A simple 'Roller' or 'Ball' Catch would be my suggestion.

It would be much better to actually calculate the length! - If you can measure the distance between the centres along with the diameters of each pully - taking account of exactly where the belt 'sits' - it's a very simple calculation. If you don't have the mathematical knowledge then by all...

The 'Standards' for Trapizoidal threads do have both a 'Fine' & 'XFine' - for 20 mm OD they are 3 & 2 respectively. As @Fitzroy has suggested though, a standard M20 with 2.5mm pitch would be the way forward.

The drawing of the thread profile - if accurate - indicates a totally non-standard thread. My initial thought on seeing it was that it might be 'Stub' ACME but the included flank angle calulates to 36.8º whereas any ACME should be 29°. The drawing also indicates a 'pitch' of 2mm so If we assume...

I'm not convinced that these figures are related to THREAD Rolling. Mild steel bar is 'rolled' as part of the manufacturing process and yes that does affect the Brinell hardness but not in the way that I'm considering which is by case hardening via a Cyanide or nitriding process - it's too long...

Thread Rolling doesn't 'Harden' the steel in any way. It does make a stronger thread (compared to a 'cut' thread) - not harder as in an increase in the Rockwell, Brinell (etc.) number - as long as it is done properly, such that the 'crest' does not have a cavity which can be due to the blank bar...

I was about to post a recommendation Elliot - I assume it is you posting? We discussed your involvement on this forum when I bought my last stick of Walnut :) I can say that I've been very pleased with everything that I've bought from Whitmore's - Excellent 'service'.

The chance that that thread is hardened is vanishingly small. The hardening process distorts the material such that further finishing has to be done. In the case of threads that would be by Grinding. This is a time-consuming - read 'expensive' - process. Looking at the images posted I suspect...

I don't know the machine but - as an engineer but this is only a guess - I suspect that it could be that the machined part is being used as a datum in two directions - both horizontally & vertically - such that the 'mating' component (of their manufacture) sits upon the 'lip' that is created...

VERY interesting. It's quite strange how (apparently) totally unrelated events conspire to provide pertinent information. There is no way the @Cooper could know that I sing in a number of choirs, nor that one of those choirs has planned a performance of the Bach St John Passion for next year...

It's a 'Casting' - to get the dimensions within the tollerance that you observe is a great achievement. The manufacturers didn't 'make' it out of square per se, they took the casting and machined just a part of the edge that needed to be square for their mating part. The fact that you wish to...

You surely didn't expect the rough casting to be 'square' ??? The top 10-12mm ish has been machined and that should be 'square' but the casting below could be anywhere. The absolute minimum I would have done would be to spot-face the hole to provide a flat surface to bolt against. I presume...

They are well worth a visit but you have to phone and book a [slot] which is 2 hours. When I bought that 3m length I was there an hour and a ¼ and they moved about 8 very large stacks of timber to dig out the board I eventually selected. You do have to take whole boards though, ie. you can't...

That would double/tripple the price I would have thought.

I assume that you want ABW - in which case, it is (relatively) expensive. I buy from Whitmore's in Claybrook Magna, Leicestershire. but you don't indicate (in your profile) where you are located so I have no idea whether that is a viable place for you to visit. You could no doubt 'buy blind' -...

2" BSP is nominally 59.61mm OD wheras 2½" BSP is 75.18. Less likely to be easily available - but closer - would be 2¼" BSP at 65.7mm

I'm sure you can understand what shape a 'V' tool is, but the difference between A 'U' and a Parabolic could well be more difficult to visualize. Here is a drawing of both; which may help you. The height of the 'U' may well be more or less than I have drawn. The salient point is not affected...