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I ran across this website: Homemade Automotive Tools
There are some great ideas on there.

Post some pics or a description of any tools/equipment you have made or modified for working on your Opel.
 

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Rear Axle Bearing and Bearing Retainer Press: Case Spreader:
 

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Rear main seal installer so you do not damage or distort the outer part of the rear main seal and it will remain flush to the block. You first install the seal lip by hand with a feeler gauge to start the seal on to the crankshaft and use this tool to seat seal flush to block. HTH
Cost is less than $5
John
 

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These were immediately at hand. I'm sure I have plenty of others.

Door pin removal tool for model 50 Opels.
 

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Dipstick tube driver. For steel pans.
 

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Torque tube pinion spline holder.
 

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Crankshaft snout wrench able tool for degree wheel installation.
 

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Oil dam installation tool (for oil drain hole at rear of cylinder head)
 

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Jacking point offset lifting pin. Allows a normal floor jack to be used on lowered Opels.
 

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Valve spring checker

This is one of my favorite tools, a valve spring pressure checker. Made of a piece of flat stock and a hunk of angle iron, the most important part is a rear wheel drum brake cylinder from a Chevy Suburban (I don't remember the year). One model has a 1-1/8" bore for the cylinder which has 0.994 square inches of piston area. When used in conjunction with a pressure gauge on the fluid "inlet", it reads directly in pounds (psi x 1 sq in). I haven't found a good method to measure the spring compression (all tries have some problems), but getting there. I use my drill press and set a known displacement, but have some worries about "slop". I'm trying to rig a small digital caliper into the system which can be "zeroed out" when the slop is gone, but need to figure out how to hold it in place. Enjoy! -- Doug
 

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Here are a few tools I have made.
13 mm distributor/ carb wrench.
17 mm Gt fuel line socket wrench.
A couple tools for bending and stretching sheet metal.
36 mm wrench for my Ford clutch fan nut.
Three different size sand bags and a wood mallet for forming sheet metal.
 

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