Hi Don...I Say Greetings: I highly recommend Garfields Pin Block Restorer. I have been using it for over 35 years and it has always worked except on two very old european uprights. The kind of pianos with candle holders on the front. Maybe they had the burred type pins in then, rather then the threaded type. If you are careful they leave no stain. I know of one technician who used a hypodermic needle, but that takes to long for me. I have four suggestions. 1st. If you are doing a grand always put newspaper between the block and the action. In many cases it will drip through. 2nd. Put in enough Garfield in to fill up the wells. 3rd. The instructions say to wait one week. I say three weeks. 4th, In a grand put a magazine under the back leg so the liquid will run forward. Using words like doubtful tonic & causes the least damage are negative and unwarranted. To repin or put in a new pinblock is very expensive. in many cases it is either Garfields or no piano,,,Fraternally Fred Weinstein MPTHi Don...I Say Greetings: I highly recommend Garfields Pin Block Restorer. I have been using it for over 35 years and it has always worked except on two very old european uprights. The kind of pianos with candle holders on the front. Maybe they had the burred type pins in then, rather then the threaded type. If you are careful they leave no stain. I know of one technician who used a hypodermic needle, but that takes to long for me. I have four suggestions. 1st. If you are doing a grand always put newspaper between the block and the action. In many cases it will drip through. 2nd. Put in enough Garfield in to fill up the wells. 3rd. The instructions say to wait one week. I say three weeks. 4th, In a grand put a magazine under the back leg so the liquid will run forward. Using words like doubtful tonic & causes the least damage are negative and unwarranted. To repin or put in a new pinblock is very expensive. in many cases it is either Garfields or no piano,,,Fraternally Fred Weinstein MPT
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