Turning Knob Not Seating Properly.

[CS388]

Hello all

 

http://i1023.photobucket.com/albums/af351/shoulderhead/144obb2_zps9ab1c6b6.jpg

 

This is my friend's Montblanc 144 (above) with the turning knob fully screwed home.

(My own, beneath, for comparison)

The knob used to screw down fully to the barrel, as it is supposed to.

The piston still works, both stages engaging and the pen taking up ink as it should.

 

The knob has the free turns when first employed, then the familiar piston strokes. When it has reached the end of it's stroke, the knob can still turn further - with a nasty grinding sound?!

 

I think it's beyond my level of expertise and may have to be sent away - but I thought I'd air it on here first and see if any advice or opinions came in.

Thanks.

 

Enjoy.

[Ron Z]

There generally are two sets of threads that have to be synchronized - one on the blind cap itself, and one for the piston. The idea is that the piston travel will stop at the front end of the barrel before the knob unscrews, and that the knob will be screwed all of the way down before the piston is fully retracted. If either end is off, you need to pull the mechanism and reset things.

[CS388]

Thanks, Ron. Excellent explanation.

 

I'll look further into it.

 

Thanks.

[fountainbel]

The filling knob screws on the left hand threaded slipping clutch of the filler mechanism.

When opening the filler knob completely, and looking in the filling knob, you will see two engagement slots at 180° which are used to screw the filling knob completely on the clutch.

Gripping on the filler knob - and using an appropriate tool- your have to screw the clutch deeper -till blockage -in the filling knob, turn counter clock wise to do so.The attached sketch shows the details of the mechanism.

Wishing you success !

Francis

http://i62.photobucket.com/albums/h89/fountainbel/Repaired%20Vintage%20fountain%20pens/VintageMBtelescopic001Kopie-1.jpg

[pavoni]

Francis, we are not worthy

 

Pavoni

[CS388]

Not worthy, indeed. Many thanks for this advice and the precise illustration, Francis. Marvellous stuff.

 

The pen has gone away (my friend was just visiting and took the pen with him, as it in daily use). I'll see him again this weekend and grab it off him again.

Can't wait to get my hands on it and experiment (carefully) with my new knowledge!

 

Again, deepest thanks to Francis and Ron.

 

Fingers crossed.

[CS388]

Hello again.

 

Thanks for help, so far. Much appreciated.

 

The pen finally came back to me yesterday - with new developments. (Please forgive my poor 'phone photography - it is used purely to illustrate the situation.)

 

Now the turning knob comes off completely. The piston still works excellently (both stages engaging and draws ink well) After filling, the knob can be screwed back into position, on the left-hand thread. Mates nicely with the barrel, but will screw off when next filled.

I've tinkered with it, but cannot get it to remain fixed to the mechanism.

I think I may be farming this one out to experts.

 

Two pictures - first one showing the knob off with piston fully engaged, second one with piston fully retracted.

 

http://i1023.photobucket.com/albums/af351/shoulderhead/pistonfullyengaged_zps669b34dc.jpg

 

http://i1023.photobucket.com/albums/af351/shoulderhead/pistonfullyretracted_zps6449a2c1.jpg

 

Anyone in the UK recommended for a repair of this nature?

 

Thanks, CS

 

[fountainbel]

The brass LH threaded bushing should be screwed firmly in the blind cap;

On the top of the bushing you can see 2 engagement slots at 180°.

Using a dedicated tool one can screw the bushing firmly in the blind cap till blockage.

I never use shellack to secure the tread fit, since dis assembling in a later stage becomes rather difficult

Well tightened the filling knob will not come off.

Francis

[CS388]

Francis! You genius!

 

I think it has worked. The knob now mates flush onto the barrel, once the pen has been filled.

I'm keeping hold of the pen for a few days, so I'll test it thoroughly. Keeping my fingers crossed.

 

I can't thank you enough. Not just for saving me money, but also for broadening all our knowledge.

I always wondered what was going on under there, on my own old Meisterstucks.

Fantastic stuff.

 

Sincere thanks and deepest respect. CS