Plastic white mounting alignment nub on M series

**tonyzoc** · 06-10-2019, 03:51 PM

So this past few weeks I've picked up 2 M series zooms, the 40-80 and the 35-70. I got them both cheap...like $15 each and both were good glass, but both are missing the little plastic white nub. I can't image this is something I can buy so I'm looking for possible replacements. My first idea is to get a white plastic bead of the approximate diameter, somehow slice it in two, and glue it in place. Has anyone else ever replaced this part and have any better ideas?

Not a Number · 06-10-2019, 08:04 PM

You have the right idea. It's even easier replacing the red bead on Minolta lenses because you don't have to cut the bead. Try an arts and crafts store like Michaels.

kypfer · 06-11-2019, 12:02 AM

Originally posted by tonyzoc

My first idea is to get a white plastic bead of the approximate diameter, somehow slice it in two, and glue it in place. Has anyone else ever replaced this part and have any better ideas?

I think it would be rather easier to buy two beads and sand or file them down (plus a couple for practise) rather than struggling to cut one small bead in half

bdery · 06-11-2019, 04:59 AM

Originally posted by tonyzoc

but both are missing the little plastic white nub. I can't image this is something I can buy so I'm looking for possible replacements. My first idea is to get a white plastic bead of the approximate diameter, somehow slice it in two, and glue it in place. Has anyone else ever replaced this part and have any better ideas?

Beads can be a good idea, or just some Sugru if you don't mind a more matte finish.

bassek · 06-18-2019, 03:17 AM

Beware!

There is a hole under the nub on some lenses. Put a piece of sticker on the hole before adding glue and new bead to avoid having glue inside lens...

Seb

**tonyzoc** · 06-30-2019, 06:33 PM

I was able to get some beads but cutting or filing them in half turned out to be easier said then done. After telling my wife about this she told me half beads were available and are used in crafts to be glued down...perfect. so the 3mm was too small...the 5mm too big. I now have 400 4mm half beads coming that I got from China for 99 cents shipped. Anyone need any

---------- Post added 06-30-19 at 06:37 PM ----------

Originally posted by bassek

Beware!

There is a hole under the nub on some lenses. Put a piece of sticker on the hole before adding glue and new bead to avoid having glue inside lens...

Seb

Good idea...I had this though as I was worried about epoxy getting into the hole and sticking to the barrel beneath...so I'm sliding a piece of thin plastic under the edge and pull it out after drying...assuming I have access ...else as you said.

06-10-2019, 03:51 PM	#1
tonyzoc Loyal Site Supporter Join Date: Jul 2018 Posts: 992	Plastic white mounting alignment nub on M series So this past few weeks I've picked up 2 M series zooms, the 40-80 and the 35-70. I got them both cheap...like $15 each and both were good glass, but both are missing the little plastic white nub. I can't image this is something I can buy so I'm looking for possible replacements. My first idea is to get a white plastic bead of the approximate diameter, somehow slice it in two, and glue it in place. Has anyone else ever replaced this part and have any better ideas?

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06-10-2019, 08:04 PM	#2
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	You have the right idea. It's even easier replacing the red bead on Minolta lenses because you don't have to cut the bead. Try an arts and crafts store like Michaels.

06-11-2019, 12:02 AM	#3
kypfer Pentaxian Join Date: Jan 2018 Location: Jersey C.I. Posts: 3,596	Originally posted by tonyzoc My first idea is to get a white plastic bead of the approximate diameter, somehow slice it in two, and glue it in place. Has anyone else ever replaced this part and have any better ideas? I think it would be rather easier to buy two beads and sand or file them down (plus a couple for practise) rather than struggling to cut one small bead in half

06-11-2019, 04:59 AM	#4
bdery Pentaxian Join Date: Mar 2008 Location: Quebec city, Canada Photos: Gallery Posts: 9,362	Originally posted by tonyzoc but both are missing the little plastic white nub. I can't image this is something I can buy so I'm looking for possible replacements. My first idea is to get a white plastic bead of the approximate diameter, somehow slice it in two, and glue it in place. Has anyone else ever replaced this part and have any better ideas? Beads can be a good idea, or just some Sugru if you don't mind a more matte finish.

06-18-2019, 03:17 AM	#5
bassek Pentaxian Join Date: Feb 2011 Photos: Gallery Posts: 706	Beware! There is a hole under the nub on some lenses. Put a piece of sticker on the hole before adding glue and new bead to avoid having glue inside lens... Seb

06-30-2019, 06:33 PM	#6
tonyzoc Loyal Site Supporter Join Date: Jul 2018 Posts: 992 Original Poster	I was able to get some beads but cutting or filing them in half turned out to be easier said then done. After telling my wife about this she told me half beads were available and are used in crafts to be glued down...perfect. so the 3mm was too small...the 5mm too big. I now have 400 4mm half beads coming that I got from China for 99 cents shipped. Anyone need any ---------- Post added 06-30-19 at 06:37 PM ---------- Originally posted by bassek Beware! There is a hole under the nub on some lenses. Put a piece of sticker on the hole before adding glue and new bead to avoid having glue inside lens... Seb Good idea...I had this though as I was worried about epoxy getting into the hole and sticking to the barrel beneath...so I'm sliding a piece of thin plastic under the edge and pull it out after drying...assuming I have access ...else as you said.