Originally Posted by
SRV1
On many Mercury's and Airsporter difficult to unscrew trigger blocks, I have used a small gas torch heating and rotataing the cylinder very quickly where the block screws in, it will be hotter than a heat gun or hair dryer!
The heat has never destroyed or discoloured the bluing - but, be sensible about it, no not cherry red!
Before unscewing, with a steel rule and scriber I will make two small alignment marks between the flat section on the trigger block and cylinder. The marks at the bottom will not be seen as the stock covers them up. Hell, the total length of this witness scribe is only about 3/16's of an inch. Hoping the last fitting was aligned!
Before heating, I wrap several turns of masking tape around the flats of the trigger block and a fair whack with a hide mallet always goes the business, the tape also stops the pins dropping out, they sometimes fear the blow with the mallet....
I also do a bit of cheating when screwing the trigger block in, if it very tight within a couple of degrees or so of alignment, rather than faff about with the hex nut that enables adjustment, I use a wide smooth flat file and take a very light dressing off the cylinder - be sensible, keep it square. No, no not an angle grinder please!
Before final fitting, copper coat the threads and check that the hex nut is tight, otherwise, the swear bow would be full in no time should it be loose.
Kind regards to all.
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