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In Switzerland they say... "zwe have no lack of sexy back" 6497 in-house auto conversion

http://www.cimier.com/

According to the GR catalogue, both the 550 and 551 use the same MS, see page 10 of this link. https://www.cousinsuk.com/PDF/categories/7810_GR Pages 141 - 150.pdf

Hi, My name is Richard. I’m a keen amateur Watch repairer and am a member of the Epping Forest Horology club in the UK. I attend weekly sessions in Watch repair and maintenance and am working towards taking my BHI examinations in the near future I hope. Glad to be here

This link... https://rwg.cc/topic/130110-valjoux-72-hole-sizes/ ... details the 7734 with hand sizes different from those at ranfft. Any use?

Thanks jdrichard!

"carless jewelers' ? I say - amateur mechanics ! it happens in cameras also. so, get your money back and learn how to sharpen a screw driver. vin

I have seen a vid (forget where) & the guy uses a small screw to open the fork installs the stud & just unscrews to release the fork.

My 8mm BTM is powered by a motor salvaged from an old (1950's) Jones sewing machine, controlled using the Jones foot pedal. I even use the rubber drive belt from the Jones. No issues with power or torque here, even at the slower speeds.

Dean DK's channel is great, well worth subscribing to.

This is a good find for those wishing to learn lathe work. Takes me back to the early 70's.

For sharpening the blades I always used an arkansas stone with a little 3 in 1 oil with the same tool that sstakoff has posted. It takes a lot of practise to get it right. If you're like me when I first tried I messed up many. Make sure you have the correct size blade for the screw again its practise, first make sure you hold the screwdriver dead upright and not leaning to a side, master that and your screwdriver won't slip out of the screw slot.

FOR SCREW DOWN CROWNS. (A) Screw down the crown tightly onto the case without the stem and measure the distance between the bottom of the crown and the case. (B ) Screw the new stem tightly into the crown, then insert into the watch until it engages and locks into the movement. (C ) Press the crown down firmly as far as it will go and hold it there. (D) Using the vernier callipers, measure the distance between the bottom of the crown and the case. (E) Subtract the size determined in (D) from the size measured in (A) then subtract a further 0.15mm from this size. This is the amount to shorten the stem by. This should allow the crown to screw full home without compressing the stem too tightly between the movement and the inside of the crown. (F) Cut the stem leaving it slightly longer than the size determined in (E), and dress down to size using the diamond lap and vernier callipers as described in the original post. (G) Screw the crown onto the shortened stem and check fit and function, before using a tiny spot of Loctite to secure. This is now added to original post by Geo.