proper indexing of the adjustment numbers from blade to blade or after cleaning

If you use Feather blades - and there is some consensus that they are among the best - start at the very lowest setting and then crank it up 1/2 to 1 notch each pass. The higher the number, the more facial hair it will grab onto, and if the number is too high it will try to get too much at once and you'll get nicks. With other blades, the higher settings (3+) might be useful, but with Feathers I've never found it necessary. Naturally, everyone has different coarseness to their beard hair, and perhaps the shaving soap you use is different from mine, so maybe your best place to start is 1.5, or 2. But I'd start at the absolute minimum and only advance it once that setting has done as much as it will. You should also try to make as few passes as possible, since more will irritate the skin.

How are blades inserted? Is it a butterfly action?

No. This is not a butterfly opening safety razor. This is a three-piece unit. The top blade head is two pieces that hold the blade in place, and when together, the two head pieces screw onto the base.

Can this shaver be used to shave private parts, shave your head, etc? I've experience bad results with none adjustable types.

Not with this type of razor or a set of irons Brother. They do make razors suitable for the head which I've seen that are round in shape check them out.

There are no instructions with razor. Besides rinsing in warm water, what else do you have to do to clean it and keep it functioning correctly?

Each week, I take it apart as if I were changing the blade, and remove the blade. Then I scrub it with some anti-bacterial hand soap using an old toothbrush and hot water. I rinse it clean, shake off the excess water, then reassemble. That process seems to work good for me.

Progress 510 Adjustable Double Edge Safety Razor Long Handle Adjustable

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109709CFA

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Description

⚙️ Elevate your shave game with precision and heritage — because your skin deserves the best.

GENTLE YET EFFECTIVE - Closed comb straight bar design ensures a close shave without irritation, perfect for sensitive skin and coarse hair alike.
ERGONOMIC LONG HANDLE - Designed for larger hands, the long brass handle offers superior control and comfort, reducing razor burns and cuts.
PRECISION ADJUSTABLE SHAVING - Twist the handle to dial in your perfect blade gap for a smooth, irritation-free shave tailored to your skin and hair type.
TIMELESS GERMAN CRAFTSMANSHIP - Made in Solingen, Germany since the 1950s, this razor combines heritage engineering with modern performance for a lifetime of use.
ECO CONSCIOUS COST EFFECTIVE - Compatible with standard double-edge blades, saving you money and reducing plastic waste with every shave.

The MERKUR Progress 510 is a premium adjustable double-edge safety razor crafted in Germany with a durable brass handle and chrome finish. Its unique twist-to-adjust blade gap lets you customize shave aggressiveness for all skin types, ensuring a smooth, irritation-free experience. Plastic-free and compatible with standard blades, it offers an eco-friendly, cost-effective grooming solution rooted in over half a century of German engineering excellence.

Specifications

ASIN	B0047Z7RNM
Age Range Description	Adult
Best Sellers Rank	#152,471 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #93 in Men's Safety Shaving Razors
Brand	MERKUR
Brand Name	MERKUR
Color	Silver
Customer Reviews	4.5 out of 5 stars 1,312 Reviews
Global Trade Identification Number	04045284012574
Handle Material	Brass
Item Dimensions	5.25 x 2.2 x 1 inches
Item Weight	0.12 Kilograms
Manual Shaving Razor Type	Safety Razor
Manufacturer	Derby International LLC, dba KANAR
Manufacturer Part Number	510.001
Material Type	Stainless Steel
Model Number	051
Number of Blades	1
Number of Items	1
Other Special Features of the Product	Adjustable
Package Type Name	Box
Skin Type	Sensitive
Special Feature	Adjustable
Style	MK-510001
Unit Count	1 Count

Reviews

D**Y

24.03.2026

H**R

16.09.2022

S**R

12.11.2016

S**E

25.03.2026

R**X

2.03.2026

Z**C

12.11.2011

J**K

12.09.2020

D**D

24.12.2012

F**B

16.05.2013

K**S

1.06.2024

J**S

19.07.2021

S**S

2.01.2026

D**I

3.04.2026

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109709CFA

Duties & taxes included

In stock

Sold byAmazon Cote D' IvoireDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cote D' Ivoire.

Secure transaction

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Progress 510 Adjustable Double Edge Safety Razor - Long Handle Adjustable Razor With Dial Made in Germany Plastic-Free Closed Comb Straight Bar

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