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Undrilling a hole in brass?

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Lainchy18/11/2019 15:02:33
244 forum posts
95 photos

One for beginners maybe.... may have already been discussed mind...

I drilled a hole in the wrong side of my S50 eccentric strap (No idea how!!), and rather than scrap it, and replace (I'd already ruined the first one - this was what was left!), I repaired it. I made a 7BA brass grub screw to fill the hole, and silver soldered this in place. It's not fully cleaned up yet of course, but the repair is 98% invisible

This is my first build, and still learning lots of course. Re-machining another cylinder casting is next... I could probably get away with the one I have made, but I'm undersized on the flanges after trying to clean them up.

Anyway - Might be useful to someone?


old mart18/11/2019 15:39:03
1753 forum posts
138 photos

Good repair, if you hadn't described what you did, no one would know as it is invisible.

Brian Sweeting18/11/2019 17:11:05
419 forum posts
1 photos

You could always have described it as an oiling point. 😉

Edited By Brian Sweeting on 18/11/2019 17:11:36

lfoggy18/11/2019 17:46:15
146 forum posts
1 photos

Most of my projects are full of hidden embelishments like that !

Jeff Dayman18/11/2019 18:44:39
1818 forum posts
45 photos

Nice job on the repair. If anyone ever notices it, you could tell them that was where the compartment for the iridium phase balancer mass pellet (0.0078 grams) was closed up. smiley

Lainchy18/11/2019 21:25:50
244 forum posts
95 photos

Thanks chaps

I did wonder about just fitting a short 7BA bolt, but I'm sure it would have annoyed me. Lesson learnt though!

Neil Lickfold18/11/2019 21:37:52
613 forum posts
102 photos

Another option would have been to have made a rivot. Made from the same material is almost impossible to see as well after being peened in place.

Lainchy18/11/2019 22:16:58
244 forum posts
95 photos

Thanks Neil. I'll remember that also. I'm sure there are lots of ways to fix

not done it yet18/11/2019 22:57:30
4639 forum posts
16 photos

If you want to see how it can be made completely invisible check out ‘clickspring’ on youtube. He does it often - not as a repair but as part of the build - although maybe not on anything particularly load-bearing.

All the same, your repair looks good and it may not be noticeable unless searched for. Might even disappear more when you get it really polished up.

You can always come back to it at some later point in time - and even replace it if you must - but carry on and get the first build done dusted and operational would be my mantra.

paul humphries20/12/2019 20:36:51
14 forum posts

Good repair, thanks for the tip.

Howard Lewis21/12/2019 22:02:52
3267 forum posts
2 photos

My wife used to have a cookbook by Monica Dickens, which extolled the virtues and means of covering up boo boos.

If you can't make it right, make it bright! (Told me by a winner of the Duke of Edinburgh Award! )


Tim Stevens22/12/2019 16:12:48
1170 forum posts

If you are likely to get into this sort of repair in a regular fashion, you might look at the range of silver-solder colours. CUP would be a start, perhaps. The lower silver content (which brings the price down) tend to be more brass coloured. But that said, they don't always mellow the same as brass as the patina takes hold - so you might rediscover your repairs in 30 years time ...

Enjoy Yule


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