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Mikevernon
Tinkerer
Username: Mikevernon
Post Number: 20
Registered: 02-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, January 19, 2013 - 04:02 am: | 
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My Minolta Autocord has a small problem with the folding hood. The rivet which connects the two halves has pulled out of the slot in the inner half, which makes the hood very difficult to fold.
Can anybody tell me where to buy such a small rivet (in the UK) and how to fit it? |
Fidji
Tinkerer
Username: Fidji
Post Number: 24
Registered: 12-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, January 19, 2013 - 06:14 am: |
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Hi,only place I know in UK is http://maccmodels.co.uk who sell one sixteenth dia brass rivets.Being half inch long you will need to cut down enough to add a washer and burr the end.Access is the problem,so the hood will have to be removed.Even then,you may not be able to tap it with a nail punch and hammer.Being brass,you may be able to compress it with long reach pliers or a G clamp.It will never be as pretty as the original,but a little matt black paint will hide most things! |
Mikevernon
Tinkerer
Username: Mikevernon
Post Number: 21
Registered: 02-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, January 19, 2013 - 06:38 am: |
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Many thanks Fidji. I'll give it a try. |
Glenn
Tinkerer
Username: Glenn
Post Number: 1050
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, January 19, 2013 - 10:12 am: |
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If one is going to use standard pan or snap head rivets, then the use of copper rivets in this instance will allow the easier forming of the retaining head. Just remember two important things - when cutting down to size make sure the cut end is filed nice and square to the shank, also be sure to fully anneal the rivet by heating to red heat and quenching in water before forming the retaining head.
Having stated the above, there is a far easier way to repair your hood. Go to any good model shop and purchase a length of copper or brass tubing - the diameter of which will go through the old rivet holes or if necessary open up the original holes to fit the tubing available. In a piece of scrap steel approx 1/4" thick drill a hole the diameter of the tubing. Anneal the tube (as above) and insert a 5/16" length in the drilled hole, then place the plate on the rear of a vice and using a small centre punch form the first head by spreading out the tube wall. This produces a rivet with a 1/4" shank, which can be cut down to length and have the retaining head formed after inserting in the components.
Note that the 'free' length of tube that is spread to form the head does not have to be very long. Up to 1/16" for the first head to be formed in the plate, however the length for the second head only needs to be sufficient to cause the tube to spread and hold the rivet in the sheet metal parts of the hood. A strip of cartridge paper placed between the hood parts and then removed once the rivet is closed will prevent the hood parts binding.
Where access is good I always use a small automatic centre punch to form and close small diameter brass and copper tube rivets. Where access is difficult one has to bend up the rivet sett from a length of suitable diameter steel bar. Always remember to make sure the rivet is rigidly supported before forming the two heads. |
Finnegan
Tinkerer
Username: Finnegan
Post Number: 260
Registered: 09-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, January 19, 2013 - 11:02 am: |
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Or you could replace the hood. |
Mikevernon
Tinkerer
Username: Mikevernon
Post Number: 22
Registered: 02-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, January 19, 2013 - 12:17 pm: |
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Glenn. That's excellent advice; thanks for taking the time. I hadn't thought of a model shop, but I'll get hold of some 2mm tubing and try the method you suggest. |
